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I need some duplicates, but using the vendor, buying something and clicking over the needed item, doesn't cut the deal no more...
This question / problem has been solved by KiNgBrAdLeY7image
low rated
If you mean for Torchlight 1, then:

Game is saved in this path: %userprofile%\Application Data\runic games\torchlight

Just back up the shared stash file, do your thing, replace the file and reenter game. You need to be in title screen where replacing the file, not in game, otherwise it won't work. Take from the SHARED stash in your inventory the items you want duplicates of, go to main title screen, overwrite file of shared stash from the backed up one (in which those items you withdrew were still inside shared stash) and there you go! Upon entering game they are going to be in your inventory and shared stash, all at the same time!

If it is about 2, sorry, i haven't got it yet.
Post edited June 27, 2016 by KiNgBrAdLeY7
FYI, the process in TL2 is the same, but the save data is in My Documents\My Games\Runic Games\Torchlight 2\save\ instead of in the appdata folder. You'll want to make sure to grab both the shared stash file and the shared stash backup file.