> In my case, in online mode, I don't need to wirte TTree.
> But I want to fill it, because we use it to see data with using TSocket connection.
> 
> How do you think about filling TTree even if write flag is not toggled ?

I implemented a fill flag for the trees in the romeConfig file.

However, if your fill flag is true and your write flag false, then the tree will be 
filled in memory completely. Which means that, if the tree is large, a memory overflow 
occurs. Therefore you should only do this for circular trees.