Need help

[sandy]

The application is developed using .net technology using SQL server
2005 as back end and its purely client server application. Serve should
be 2003 win and client machine should have minimum win XP.

TASK: Application mainly divided into three parts Registration, billing
and inventory and lots of small other utilities. We need identify one
tool which will do the performance testing ...like tool should able 150
logins and should able to automate transaction for around 100 users.
Is there any performance tool for client server application?

Please one favor for me, please any have done performance testing on
client server application. How to make strategy and what thing needs to
take under consideration.