# How to “un-use” a package?

When using packages in LaTeX (or XeLaTeX, in my case), I load packages with \usepackage[options]{package}, but how can I "un-use" the package later in the document?

Is that even possible?

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What is the intention of you question? So far every global defined command is used in the whole document. So you have to set every command or the relevant command to undefined. –  Marco Daniel Nov 10 '11 at 10:02
No this is not possible. You can naturally overwrite definitions and settings made by a package. –  Ulrike Fischer Nov 10 '11 at 10:02