Jeepers... leave my laptop for a minute and three other posts sneak in there.

CALLing another script is no good cuz the var just isn't there. YOu could push a link to the RunOnce key cuz that is the last thing processed in the logon sequence.

I just had another thought... give one of the helper apps I mention in the FAQ a go. Warren Simondson's ClientInfo should be able to pull what you need since it does not rely on the env var.
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