Community Tip - Visit the PTCooler (the community lounge) to get to know your fellow community members and check out some of Dale's Friday Humor posts!
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Session ID is the ID number that Pro|E assigns to every part or assy opened. The numbers are assigned as things are opened and change with every session of Pro|E. I don't think you can show them in the model tree, but you can find them while in an assy be going to relations, then show -> session ID.
