>>>>Hi All,
>>>>
>>>>I developed a copy-protect method with some utitilies from UT and other VFP sources. It looks cpu, hdd serial etc...
>>>>I was use .dbf file and lock one record for each user when developing .dbf based applications for RDP users.
>>>>How can I control active user counts at SQL Server?
>>>
>>>You can use the same idea as in VFP. Every time the user log in, you create a new record in the table, say, Logins, and in the application destroy you update this record with the logout time.
>>
>>What will I do when application crashed?
>
>If application crashed, you can delete (update) all records in that table.

Of course, some of big turkish software firms use this way (they have a fixuser.exe ) but I think so it doesn't so much safe.