Another option is to simply check for the existence of SMS on the local computer in the registry. If it is there, then go ahead and run the SMS script. You would just have to be sure on new computers to manually install SMS the first time on those computers you wish to have SMS manage. I don't remember the SMS keys in the registry off-hand, but you should be able to find some with a simple search.

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Regards,

Brad
Consultant
Net InfraStructure, Inc