Key Stroke Loggers

[Ryan Behan]

Can anyone recommend a proven keystroke logger.  We are doing performance testing for a client and at around 1500 concurrent users we're seeing some sessions start to hang up on a particular screen.  We think key strokes aren't being received by the application.  I'm thinking of using a keystroke logger in each session to verify if it's us or the load testing software.

Thanks,
     Ryan