can i use web server stress tool to test my VB app?

Hallo, i have developed a visual basic application , it is a university registration system, and i want to know how many students can register at a certian time on the server i use, can i use those web-server stress tool to find that out, or there is another way to do this,

edit : my application is a LAN application, not a web-based one!

thanks in advance,

What DB are you using? Access has a pretty low limit, while SQL Server and MySQL can generally handle a lot more concurrent users.