licence question

2012-03-28  Source: Original Site  Category:Visual Basic  Views:0 

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how to limit the number of users use the program at the same time (open the same program 5 times - 5 same program windows opened)? I want to make a program (multi-user ) like: if a user buys 2 licences, this program can be only opened 'two windows (copy)'. And if three bought, 3 can be opened. Please tell me how to do it.

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