How do I switch using two machines with a license (No QTL) ?

Hello,

     We have a lot of QTL issues. There is a common issue.  

     I will give you an example. 

            - There are two machines using STAAD.Pro by checking out/In.    

            - It always records an over access when I checked in the license at machine-A and then check out the license again at machine-B after 10 minutes (estimation).

     So, How do I do it without an over access ?

Thank you.

REI