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From: Joe Corneli <jcorneli@math.utexas.edu>
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Subject: Re: elisp: set-register
Date: Mon, 15 Nov 2004 23:58:28 -0600
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You could use (string-to-char "p") to figure out what REGISTER to
use.  Referring to the source, it doesn't appear that ARG is
actually used in the function `window-configuration-to-register', so
for that argument just use nil (or nothing, since it is optional).