The Extras directory contains an empty version of updates.lsp.  Extentions to Arc may be added from time to time, and these should be stored in this directory.  The most likely source for extentions is <http://www.stat.umn.edu/arc> but others are possible as well.

For example, if you download a file called dispmod.lsp, you can use its contents in Arc by putting it in the Extras directory.  All files in this directory ending in .lsp or .fsl are loaded in alphabetical order.
