Hello Rooters, Could someone spell out the relationship between TFile and TTree classes? My motivation in asking is a desire to read from an existing tree, process some data, write results to a separate (previously non-existent) tree, and then go back to reading from tree 1 in order to repeat -- thus several trees would be open at the same time -- all of which "belong" to different files. I am a little unclear how a tree gets "linked" to a given file. Reading seems fairly intuitive: open a file, then "Get" part of that file with the name of the tree. However, writing seems like a bit of a mystery to me: declare a file, and then the first tree declared after it is "its" tree? I know the forum desires specific problems with code/etc.-- my apologies in advance to any offended! Thanks! Mark
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