>>Hola Carlos,
>>
>>If you want to grant 10 licenses, create a table with 10 records. Whenever a user logs in, he grabs the first available record and locks it.
>>
>>When 10 records are locked, no more users can grab a license and the program bounces them.
>>
>>If any workstation crashes, its locked record is released.
>>
>>This is the simplest way I've seen for implementing what you need, but I'm sure that someone can poke holes at it and/or come up with something more interesting.
>>
>>alex
>

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>But what if the user add records to the table?

Aha! That's where your creativity comes into play. If you're not dealing with the guys from Lopht or the Legion of Doom, you could just use a 200 character field and among what appears to be garbage, include significant information, such as the record number (so they don't just copy a single record 20 times to get 20 licenses), expiration dates, you name it...

Now, if you're dealing with the above mentioned groups, I don't think there's ANYTHING you can do that would be worth the work you'll do. ;-)

Alex