To Martijn Tonies,

Thank for reply.

I am mean is interbase 5.6 have user licenses to control on number of
users login concurrently. e.g If i bought 20 user licenses, the
interbase only allow 20 users to log into database concurrently.

Did firebird have built-in function or any other external user define
function to allow me to control number of user login?

Thank You.