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I have been having a problem when trying to use offset. If I select offset and try to specify a distance the program crashes and everything not saved is gone. Can't figure out what I'm doing wrong. As soon as I touch the keyboard it crashes.
You don't mention which program, or which OS. Both of those are necessary to coherently answer any questions.
I recommend looking in the AutoCAD LT board: http://forums.autodesk.com/t5/AutoCAD-LT-General/bd-p/43
There's a number of existing posts about OFFSET which may answer your question.