I have to agree w/Howard and sealeopard, in effect you're circumventing the basic reason for your security. Allowing a user admin rights on a temporary basis is one thing, uncontrolled SW installs will become unmanageable.

What is the turn around time for a user to request this from the help desk? I would stress to management that loss of any control over the workstations, and the support headaches that go with it, is what made the help desk and limited number of admins a cost effective solution.
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~Glenn

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Deadlines take their toll.
Please have exact change.