I thought "AT" command (this is used of scheduling jobs) should be more appropriate in this case. But, may have problem in Vista. Anyway, I had not tested it.
Most of the methods used to protect application has some draw backs. A dongle may fail and it will cause unnecessary hardship to your customer. You will lose your goodwill.
You may consider leasing instead of permanent license. In that way you can officially set expiry date and have send them a...
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