Switching windows with added command

"Dan D." <[email protected]>
Newsgroups gmane.comp.gnu.screen.user
Message-ID <[email protected]> 
Hello,

When switching between windows holding the metakey plus other possible keys 
is it possible to send an bash alias as an auto part of the switch.

For example if switching into a window holding a running program, can a 
command be sent to that running program as the swittch is underway?

Thnks.
XB
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