Hi, I've redirected all of my outputs in an other directory with my own names after each run of tools.. But when the users want to rename their datasets on the history, I would want that this change occurs on my output files already register in the computer. So where can I find the xml file of the function "edit attribute" and from this file, can I take the real name of my output file before the change? Another question is about the history name : because the users use several history, I need to know how call the variable of the history name ; for exemple if an output variable is $output, the history name of this variable is : $output.history_name ? or $output.history.name? or if this name is not accessible in this way, may be the history id ? In my first step when I rename an output, I take the $output.hid which indicate me the number of the dataset in an history. But I've not found the name of this history. Thanks Julie