An additional functionality has been implemented on the equipment table:

You can now select several elements by Ctrl/Shift-Click on their names, then change the 
first one. After a confirmation dialog, all selected variables are then set to the new 
value. This way one can very easily change all values to zero etc.

Stefan

Dear beloved MIDAS users,

I'm happy to announce a "holiday update" for MIDAS. In countless hours, Zaher from 
PSI worked hard to introduce syntax highlighting in the midas script editor. In 
addition, there are additional features like a cleaner user interface, the option 
to see all variables also in non-debug mode and more. Have a look at the picture 
below, doesn't it beginning to look a lot like Christmas?

We have tested this quite a bit and went through many iterations, but no guarantee 
that it's flawless. So please report any issue here.

I wish you all a happy holiday season,
Stefan

Hi Stefan and Zaher,

there is a problem with the new sequencer interface for midas.

If I understand the msequencer code correctly:
Under '/Sequencer/State/Path' the path can be defined from where the msequencer gets the files, generates the xml, etc.
However, the new javascript code reads/writes the files to '<exp>/userfiles/sequencer/'

If the path in the ODB is different to '<exp>/userfiles/sequencer/', it leads to quite some unexpected behavior. If '<exp>/userfiles/sequencer/' is the place where things should go, the ODB entry of the msequencer and the internal handling should probably adopted, no?

Andreas

> Dear beloved MIDAS users,
> 
> I'm happy to announce a "holiday update" for MIDAS. In countless hours, Zaher from 
> PSI worked hard to introduce syntax highlighting in the midas script editor. In 
> addition, there are additional features like a cleaner user interface, the option 
> to see all variables also in non-debug mode and more. Have a look at the picture 
> below, doesn't it beginning to look a lot like Christmas?
> 
> We have tested this quite a bit and went through many iterations, but no guarantee 
> that it's flawless. So please report any issue here.
> 
> I wish you all a happy holiday season,
> Stefan

> If I understand the msequencer code correctly:
> Under '/Sequencer/State/Path' the path can be defined from where the msequencer gets the files, generates the xml, etc.
> However, the new javascript code reads/writes the files to '<exp>/userfiles/sequencer/'
> 
> If the path in the ODB is different to '<exp>/userfiles/sequencer/', it leads to quite some unexpected behavior. If '<exp>/userfiles/sequencer/' is the place where things should go, the ODB entry of the msequencer and the internal handling should probably adopted, no?

Indeed there is a change in philosophy. Previously, /Sequencer/State/Path could point anywhere in the file system. This was considered a security problem, since one could access system files under /etc for example via the midas interface. When the new file API was 
introduced recently, it has therefor been decided that all files accessible remotely should reside under <exp>/userfiles. If an experiment needs some files outside of that directory, the experiment could define some symbolic link, but that's then in the responsibility of 
the experiment. 

To resolve now the issue between the sequencer path and the userfiles, we have different options, and I would like to get some feedback from the community, since *all experiments* have to do that change.

1) Leave thins as they are, but explain that everybody should modify /Sequencer/Stat/Path to some subdirectory of <exp>/userfiles/sequencer

2) Drop /Sequencer/State/Path completely and "hard-wire" it to <exp>/usefiles/sequencer

3) Make /Sequencer/State/Path relative to <exp>/userfiles. Like if /Sequencer/State/Path=test would then result to a final directory <exp>/userfiles/sequencer/test

I'm kind of tempted to go with 3), since this allows the experiment to define different subdirectories under <exp>/userfiles/sequencer/... depending on the situation of the experiment.

Best,
Stefan

> > If I understand the msequencer code correctly:
> > Under '/Sequencer/State/Path' the path can be defined from where the msequencer gets the files, generates the xml, etc.
> > However, the new javascript code reads/writes the files to '<exp>/userfiles/sequencer/'
> > 
> > If the path in the ODB is different to '<exp>/userfiles/sequencer/', it leads to quite some unexpected behavior. If '<exp>/userfiles/sequencer/' is the place where things should go, the ODB entry of the msequencer and the internal handling should probably adopted, no?
> 
> Indeed there is a change in philosophy. Previously, /Sequencer/State/Path could point anywhere in the file system. This was considered a security problem, since one could access system files under /etc for example via the midas interface. When the new file API was 
> introduced recently, it has therefor been decided that all files accessible remotely should reside under <exp>/userfiles. If an experiment needs some files outside of that directory, the experiment could define some symbolic link, but that's then in the responsibility of 
> the experiment. 
> 
> To resolve now the issue between the sequencer path and the userfiles, we have different options, and I would like to get some feedback from the community, since *all experiments* have to do that change.
> 
> 1) Leave thins as they are, but explain that everybody should modify /Sequencer/Stat/Path to some subdirectory of <exp>/userfiles/sequencer
> 
> 2) Drop /Sequencer/State/Path completely and "hard-wire" it to <exp>/usefiles/sequencer
> 
> 3) Make /Sequencer/State/Path relative to <exp>/userfiles. Like if /Sequencer/State/Path=test would then result to a final directory <exp>/userfiles/sequencer/test
> 
> I'm kind of tempted to go with 3), since this allows the experiment to define different subdirectories under <exp>/userfiles/sequencer/... depending on the situation of the experiment.
> 
> Best,
> Stefan

For me the option 3) seems the most coherent one.
Andreas

> > 3) Make /Sequencer/State/Path relative to <exp>/userfiles. Like if /Sequencer/State/Path=test would then result to a final directory <exp>/userfiles/sequencer/test
> > 
> > I'm kind of tempted to go with 3), since this allows the experiment to define different subdirectories under <exp>/userfiles/sequencer/... depending on the situation of the experiment.
> > 
> > Best,
> > Stefan
> 
> For me the option 3) seems the most coherent one.
> Andreas

Ok, I implemented option 3) above. This means everybody using the midas sequencer has to change /Sequencer/State/Path to an empty string and move the 
sequencer files under <exp>/userfiles/sequencer as a starting point. I tested most thing, including the INCLUDE statements, but there could still be
a bug here or there, so please give it a try and report any issue to me.

Best,
Stefan

Custom plots including scatter, histogram and color map plots have been 
implemented. This lets you plot graphs of X/Y data or histogram data stored in the 
ODB on a custom page. For some examples and documentation please go to

https://daq00.triumf.ca/MidasWiki/index.php/Custom_plots_with_mplot

Enjoy!
Stefan

Starting around ROOT 6.30, there is a new dependency requirement for nlohmann-json3-dev from https://github.com/nlohmann/json.

If you use a Ubuntu-22 ROOT binary kit from root.cern.ch, MIDAS build will bomb with errors: Could not find a package configuration file provided by "nlohmann_json"

Per https://root.cern/install/dependencies/ install it:

apt install nlohmann-json3-dev

After this MIDAS builds ok.

K.O.

I pushed some buttons in bitbucket user groups and permissions to make it happy 
wrt recent changes.

The intended configuration is this:

- two user groups: admins and developers
- admins has full control over the workspace, project and repositories ("Admin" 
permission)
- developers have push permission for all repositories (not the "create 
repository" permission, this is limited to admins) ("Write" permission).
- there seems to be a quirk, admins also need to be in the developers group or 
some things do not work (like "run pipeline", which set me off into doing all 
this).
- admins "Admin" permission is set at the "workspace" level and is inherited 
down to project and repository level.
- developers "Write" permission is set at the "project" level and is inherited 
down to repository level.
- individual repositories in the "MIDAS" project also seem to have explicit 
(non-inhertited) permissions, I think this is redundant and I will probably 
remove them at some point (not today).

K.O.

Our MIDAS frontend for WIENER power supplies is now available as a standalone git repository.

https://bitbucket.org/ttriumfdaq/fewienerlvps/src/master/

This frontend use the snmpwalk and snmpset programs to talk to the power supply.

Also included is a simple custom web page to display power supply status and to turn things on and off.

This frontend was originally written for the T2K/ND280 experiment in Japan.

In addition to controlling Wiener low voltage power supplies, it was also used to control the ISEG MPOD high 
voltage power supplies.

In Japan, ISEG MPOD was (still is) connected to the MicroMegas TPC and is operated in a special "spark counting" 
mode. This spark counting code is still present in this MIDAS frontend and can be restored with a small amount of 
work.

K.o.

you may have heard the news of a major problem with the xz-utils project, authors of the popular "xz" file compression, 
https://nvd.nist.gov/vuln/detail/CVE-2024-3094

the debian bug tracker is interesting reading on this topic, "750 commits or contributions to xz by Jia Tan, who backdoored it", 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068024

and apparently there is problems with the deisng of the .xz file format, making it vulnerable to single-bit errors and unreliable checksums,
https://www.nongnu.org/lzip/xz_inadequate.html

this moved me to review status of file compression in MIDAS.

MIDAS does not use or recommend xz compression, MIDAS programs to not link to xz and lzma libraries provided by xz-utils.

mlogger has built-in support for:
- gzip-1, enabled by default, as the most safe and bog-standard compression method
- bzip2 and pbzip2, as providing the best compression
- lz4, for high data rate situations where gzip and bzip2 cannot keep up with the data

compression benchmarks on an AMD 7700 CPU (8-core, DDR5 RAM) confirm the usual speed-vs-compression tradeoff:

note: observe how both lz4 and pbzip2 compress time is the time it takes to read the file from ZFS cache, around 6 seconds.
note: decompression stacks up in the same order: lz4, gzip fastest, pbzip2 same speed using 10x CPU, bzip2 10x slower uses 1 CPU.
note: because of the fast decompression speed, gzip remains competitive.

no compression: 6 sec, 270 MiBytes/sec,
lz4, bpzip2:    6 sec, same, (pbzip2 uses 10 CPU vs lz4 uses 1 CPU)
gzip -1:       21 sec,  78 MiBytes/sec
bzip2:         70 sec,  23 MiBytes/sec (same speed as pbzip2, but using 1 CPU instead of 10 CPU)

file sizes:

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ ls -lSr test.mid*
-rw-r--r-- 1 dsdaqdev users  483319523 Apr  1 14:06 test.mid.bz2
-rw-r--r-- 1 dsdaqdev users  631575929 Apr  1 14:06 test.mid.gz
-rw-r--r-- 1 dsdaqdev users 1002432717 Apr  1 14:06 test.mid.lz4
-rw-r--r-- 1 dsdaqdev users 1729327169 Apr  1 14:06 test.mid
(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ 

actual benchmarks:

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time cat test.mid > /dev/null
0.00user 6.00system 0:06.00elapsed 99%CPU (0avgtext+0avgdata 1408maxresident)k

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time gzip -1 -k test.mid
14.70user 6.42system 0:21.14elapsed 99%CPU (0avgtext+0avgdata 1664maxresident)k

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time lz4 -k -f test.mid
2.90user 6.44system 0:09.39elapsed 99%CPU (0avgtext+0avgdata 7680maxresident)k

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time bzip2 -k -f test.mid
64.76user 8.81system 1:13.59elapsed 99%CPU (0avgtext+0avgdata 8448maxresident)k

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time pbzip2 -k -f test.mid
86.76user 15.39system 0:09.07elapsed 1125%CPU (0avgtext+0avgdata 114596maxresident)k

decompression benchmarks:

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time lz4cat  test.mid.lz4 > /dev/null
0.68user 0.23system 0:00.91elapsed 99%CPU (0avgtext+0avgdata 7680maxresident)k

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time zcat  test.mid.gz > /dev/null
6.61user 0.23system 0:06.85elapsed 99%CPU (0avgtext+0avgdata 1408maxresident)k

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time bzcat  test.mid.bz2 > /dev/null
27.99user 1.59system 0:29.58elapsed 99%CPU (0avgtext+0avgdata 4656maxresident)k

(vslice) dsdaqdev@dsdaqgw:/zdata/vslice$ /usr/bin/time pbzip2 -dc test.mid.bz2 > /dev/null
37.32user 0.56system 0:02.75elapsed 1377%CPU (0avgtext+0avgdata 157036maxresident)k

K.O.

> Stefan and I have been working on improving the sequencer editor ...

Looks grand! Congratulations with getting it completed. The previous version was 
my rewrite of the old generated-C pages into html+javascript, nothing to write 
home about, I even kept the 1990-ies-style html formatting and styling as much as 
possible.

K.O.

I am not sure I have seen this documented before. MIDAS RPC data format.

1) RPC request (from client to mserver), in rpc_call_encode()

1.1) header:

4 bytes NET_COMMAND.header.routine_id is the RPC routine ID
4 bytes NET_COMMAND.header.param_size is the size of following data, aligned to 8 bytes

1.2) followed by values of RPC_IN parameters:

arg_size is the actual data size
param_size = ALIGN8(arg_size)

for TID_STRING||TID_LINK, arg_size = 1+strlen()
for TID_STRUCT||RPC_FIXARRAY, arg_size is taken from RPC_LIST.param[i].n
for RPC_VARARRAY|RPC_OUT, arg_size is pointed to by the next argument
for RPC_VARARRAY, arg_size is the value of the next argument
otherwise arg_size = rpc_tid_size()

data encoding:

RPC_VARARRAY:
4 bytes of ALIGN8(arg_size)
4 bytes of padding
param_size bytes of data

TID_STRING||TID_LINK:
param_size of string data, zero terminated

otherwise:
param_size of data

2) RPC dispatch in rpc_execute

for each parameter, a pointer is placed into prpc_param[i]:

RPC_IN: points to the data inside the receive buffer
RPC_OUT: points to the data buffer allocated inside the send buffer
RPC_IN|RPC_OUT: data is copied from the receive buffer to the send buffer, prpc_param[i] is a pointer to the copy in the send buffer

prpc_param[] is passed to the user handler function.

user function reads RPC_IN parameters by using the CSTRING(i), etc macros to dereference prpc_param[i]

user function modifies RPC_IN|RPC_OUT parameters pointed to by prpc_param[i] (directly in the send buffer)

user function places RPC_OUT data directly to the send buffer pointed to by prpc_param[i]

size of RPC_VARARRAY|RPC_OUT data should be written into the next/following parameter.

3) RPC reply

3.1) header:

4 bytes NET_COMMAND.header.routine_id contains the value returned by the user function (RPC_SUCCESS)
4 bytes NET_COMMAND.header.param_size is the size of following data aligned to 8 bytes

3.2) followed by data for RPC_OUT parameters:

data sizes and encodings are the same as for RPC_IN parameters.

for variable-size RPC_OUT parameters, space is allocated in the send buffer according to the maximum data size
that the user code expects to receive:

RPC_VARARRAY||TID_STRING: max_size is taken from the first 4 bytes of the *next* parameter
otherwise: max_size is same as arg_size and param_size.

when encoding and sending RPC_VARARRAY data, actual data size is taken from the next parameter, which is expected to be 
TID_INT32|RPC_IN|RPC_OUT.

4) Notes:

4.1) RPC_VARARRAY should always be sent using two parameters:

a) RPC_VARARRAY|RPC_IN is pointer to the data we are sending, next parameter must be TID_INT32|RPC_IN is data size
b) RPC_VARARRAY|RPC_OUT is pointer to the data buffer for received data, next parameter must be TID_INT32|RPC_IN|RPC_OUT before the call should 
contain maximum data size we expect to receive (size of malloc() buffer), after the call it may contain the actual data size returned
c) RPC_VARARRAY|RPC_IN|RPC_OUT is pointer to the data we are sending, next parameter must be TID_INT32|RPC_IN|RPC_OUT containing the maximum 
data size we are expected to receive.

4.2) during dispatching, RPC_VARARRAY|RPC_OUT and TID_STRING|RPC_OUT both have 8 bytes of special header preceeding the actual data, 4 bytes of 
maximum data size and 4 bytes of padding. prpc_param[] points to the actual data and user does not see this special header.

4.3) when encoding outgoing data, this special 8 byte header is removed from TID_STRING|RPC_OUT parameters using memmove().

4.4) TID_STRING parameters:

TID_STRING|RPC_IN can be sent using oe parameter
TID_STRING|RPC_OUT must be sent using two parameters, second parameter should be TID_INT32|RPC_IN to specify maximum returned string length
TID_STRING|RPC_IN|RPC_OUT ditto, but not used anywhere inside MIDAS

4.5) TID_IN32|RPC_VARARRAY does not work, corrupts following parameters. MIDAS only uses TID_ARRAY|RPC_VARARRAY

4.6) TID_STRING|RPC_IN|RPC_OUT does not seem to work.

4.7) RPC_VARARRAY does not work is there is preceding TID_STRING|RPC_OUT that returned a short string. memmove() moves stuff in the send buffer, 
this makes prpc_param[] pointers into the send buffer invalid. subsequent RPC_VARARRAY parameter refers to now-invalid prpc_param[i] pointer to 
get param_size and gets the wrong value. MIDAS does not use this sequence of RPC parameters.

4.8) same bug is in the processing of TID_STRING|RPC_OUT parameters, where it refers to invalid prpc_param[i] to get the string length.

K.O.

> 4.5) TID_IN32|RPC_VARARRAY does not work, corrupts following parameters. MIDAS only uses TID_ARRAY|RPC_VARARRAY

fixed in commit 0f5436d901a1dfaf6da2b94e2d87f870e3611cf1, TID_ARRAY|RPC_VARARRAY was okey (i.e. db_get_value()), bug happened only if rpc_tid_size() 
is not zero.

> 
> 4.6) TID_STRING|RPC_IN|RPC_OUT does not seem to work.
> 
> 4.7) RPC_VARARRAY does not work is there is preceding TID_STRING|RPC_OUT that returned a short string. memmove() moves stuff in the send buffer, 
> this makes prpc_param[] pointers into the send buffer invalid. subsequent RPC_VARARRAY parameter refers to now-invalid prpc_param[i] pointer to 
> get param_size and gets the wrong value. MIDAS does not use this sequence of RPC parameters.
> 
> 4.8) same bug is in the processing of TID_STRING|RPC_OUT parameters, where it refers to invalid prpc_param[i] to get the string length.

fixed in commits e45de5a8fa81c75e826a6a940f053c0794c962f5 and dc08fe8425c7d7bfea32540592b2c3aec5bead9f

K.O.

I now fully understand the MIDAS RPC code, had to add some debugging printfs, 
write some test code (odbedit test_rpc), catch and fix a few bugs.

Fixes for the bugs are now committed.

Small refactor of rpc_execute() should be committed soon, this removes the 
"goto" in the memory allocation of output buffer. Stefan's original code used a 
fixed size buffer, I later added allocation "as-neeed" but did not fully 
understand everything and implemented it as "if buffer too small, make it 
bigger, goto start over again".

After that, I can implement support for std::string and std::vector<char>.

The way it looks right now, the on-the-wire data format is flexible enough to 
make this change backward-compatible and allow MIDAS programs built with old 
MIDAS to continue connecting to the new MIDAS and vice-versa.

MIDAS RPC support for std::string should let us improve security by removing 
even more uses of fixed-size string buffers.

Support for std::vector<char> will allow removal of last places where 
MAX_EVENT_SIZE is used and simplify memory allocation in other "give me data" 
RPC calls, like RPC_JRPC and RPC_BRPC.

K.O.

• ODB over Frontend precedence.
  When starting a FE client, the equipment settings are taken from the ODB if this equipment already existed. This meant the ODB has precedence over the EQUIPEMENT structure and whatever change you apply to the C-Structure, it will NOT be taken in consideration until you clean (remove) the equipment tree in ODB.
  
  
• Revived 64 bit support. This was required as more OS are already supporting such architecture. Originally Midas did support Alpha/OSF/1 which operated on 64 bit machine. This new code has been tested on SL4.2 with Dual-Core 64-bit AMD Opterons.
  
  
• Multi-threading in Slow Control equipments.
  Check entry 289 in Midas Elog from Stefan.
  
  
• mhttpd using external Elog.
  The standalone ELOG package can be coupled to an existing experiment and therefore supersede the internal elog functionality from mhttpd.
  This requires a particular configuration which is described in the documentation.
  
  
• MySQL test in mlogger
  A reminder that mlogger can generate entries in a MySQL database as long as the pre-compilation flag -HAVE_MYSQL is enabled during system built. The access and form filling is then defined from the ODB under Logger/SQL once the logger is running, see documentation.
  
  
• Directory destination for midas.log and odb dump files
  It is now possible to specify an individual directory to the default midas.log file as well as to the "ODB Dump file" destination. If either of these fields contains a preceding directory, it will take the string as an absolute path to the file.
  
  
• User defined "event Data buffer size" (ODB)
  The event buffer size has been until now defined at the system level in midas.h. It is now possible to optimize the memory allocation specific to the event buffer with an entry in the ODB under /experiment, see documentation.
  
  
• History group display
  It is now possible to display an individual group of history plots. No documentation on that topics as it should be self explanatory.
  
  
• History export option
  From the History web page, it is possible to export to a ASCII .csv file the history content. This file can later be imported into excel for example. No documentation on that topics as it should be self explanatory.
  
  
• Multiple "minor" corrections:
  - Alarm reset for multiple experiment (return directly to the experiment).
  - mdump -b option bug fixed.
  - Alarm evaluation function fixed.
  - mlogger/SQL boolean handling fixed.
  - bm_get_buffer_level() was returning a wrong value which has been fixed now.
  - Event buffer bug traced and exterminated (Thanks to Konstantin).
  

I committed an updated lazylogger with updated documentation. The new version supports subruns and 
can save to external storage arbitrary files (i.e. odb dump files). It also moves most book keeping out of 
odb to permit handling more files on bigger storage disks.

Example lazylogger scripts for castor (CERN) and dcache (TRIUMF) are in the directory "utils".

The lazylogger documentation was updated to remove obsolete information and to describe the new 
functions. As usual "make dox; cd doxfiles/html; firefox index.html" or see my copy at:

http://ladd00.triumf.ca/~olchansk/midas/Utilities.html#lazylogger_task

svn rev 4615, 4616.
K.O.

The general Midas documentation has been rejuvenated by Suzannah Daviel through 
a proof reading and with a collection of custom perl scripts to improve the 
Doxygen capabilities for the document itself. In particular, a contents list and 
alphabetical index of the documentation is generated automatically.

The new content is based on the previous version but with more cross-references, 
examples and descriptive images where necessary. Many of the previously 
undocumented features are now included.

The layout and organization is slightly different and requires getting used to, 
but hopefully will be an improvement.
Some of the changes are:
- The main topics are maintained, but we try to regroup all the aspects
  related to a particular topic in the same section.
- The Yellow icons provide navigation within the index section.
- The Blue icons provide navigation within the section content.

The full documentation is included under the midas/doc/src directory in the 
Midas distribution (SVN) and can be generated with the Doxygen tool.
The midasdoc-images.tar.gz from either https://midas.psi.ch/download/ or 
http://ladd00.triumf.ca/~daqweb/ftp/ needs to be extracted to the midas 
directory under doc/images for complete local web pages generation.

There are a few "ToDo" items which hopefully will be ironed out soon.
Feel free to contact us for pointing out omissions or improvements.

We hope this online documentation will serve as a better tool for your 
understanding of the Midas capabilities.

The final bits of the JSON-RPC API to MIDAS are committed. The API uses the Javascript Promise mechanism (supported on all 
supported platforms - MacOS, Windows, Linux Ubuntu, el5, el6, el7).

Simple example for pasting the current run number into an html element:

mjsonrpc_db_get_values(["/runinfo/run number"]).then(function(rpc) {
   document.getElementById("run_number").innerHTML = rpc.response.data[0];
}).catch(function(error) {
   mjsonrpc_error_alert(error);
});

The documentation for the JSON-RPC API, including special quirks in JSON encoding of ODB data is here:
https://midas.triumf.ca/MidasWiki/index.php/Mjsonrpc

Documentation (with examples) for the related Javascript functions in mhttpd.js is here (via Doxygen):
https://daq.triumf.ca/~daqweb/doc/midas-devel/html/group__mjsonrpc__js.html

Examples of using all mhttpd.js functions is in .../examples/javascript1/example.html

The experimental git branch feature/mhttpd_js implements the MIDAS "programs" page purely in html and javascript,
go there to see all this new JSON and RPC stuff in action. See .../resources/programs.html.

K.O.