''[MGS]'' [[2003/04/04]] - I wanted a way to cache idle commands i.e. to be able to schedule the same command multiple times (before the event loop is re-entered), and then have the command run only once. Following [Darren New]'s code snippet, I came up with this simple solution:

 proc idle {args} {
   eval after cancel $args
   return [eval after idle $args]
 }