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Heya peoples, I'm going round in circles on this one and it might just be down to my poor understanding of python and/or houdini. I've managed to get 90% of what I want for this tool complete but the final piece evades me. I've got a python tempfile.TemporaryFile being created when 456.py is triggered - it works perfectly - i.e. created upon opening a hip and deleted once the hip is closed I think what I want to do is trigger the 456.py from within a shelf tool (which is a custom saver script) I mean this is essentially the age-old quest for an "onSave" callback but sadly I have no understanding of C++ or the HDK so this solution is totally lost on me. Any pointers appreciated Cheers