i really don't think it can be done.
part of user switching is memory protection. whatever you have as user A can't be fucked up by user B...and i have to assume that this is going to prevent output of any ongoing process in a user account to another account.
the flip side is it's easy to go back and forth?
you could always try asking at the genius bar at an apple store...those folks have come up with some pretty odd solutions to some problems i've had.
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For God so loved creation, that God sent God's only Son that whosoever believed should not perish, but have everlasting life.
-John 3:16
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