Hello Jim,
I posted this a while back, it's a script that loads when the user logs on(dunno if that's a limitation for you or not), allowing you to make them run ANY script at ANY time. Don't know if it's what you're looking for or not? You could execute a RUNAS script from this and have it authenticate to the domain?

http://81.17.37.55/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=2&t=001695&p=
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Scott Hickerson Network Design Engineer