Starting something from .ratpoisonrc once X has settled in.

Hello, all,

  There are a few things that don't run properly unless X has fully
started. e.g. I have an xmodmap script to change the Caps-Lock to Esc.
Right now, the bottom of my .ratpoisonrc says

sleep 15; /home/me/bin/escmap

but sometimes that works and sometimes it doesn't.  Is there some real
hook I can wait for in .ratpoisonrc?

 Sincerely yours,
   John B.
-- 
I didn't really say everything I said. -Yogi Berra