''unload ?switches? fileName ?packageName? ?interp?''

Eventually, the doc should appear here:
http://www.purl.org/tcl/home/man/tcl8.5/TclCmd/unload.htm

New command in Tcl 8.5. See TIP 100 [http://tcl.tk/cgi-bin/tct/tip/100.html] from [George Petasis] for where it came from.

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Hints for extension authors who want to have an unloadable extension:

   * Be prepared for extra work when using a custom Tcl_Object type with non-NULL freeProc
   * Be extremly careful in your use of TSD  
   * Be prepared for trouble if your extension involves the VFS layer
   * ...

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[Category Command]