>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.