Once the CAT4 software has been installed it is available from your Programs List and as a short cut on the desktop.
Click the Desktop Shortcut to start the program.
Click Start > All Programs > Pen CS > Pen CS CAT4
This will load the login screen
Enter your Username and Password and click 'Login'
This will load the dashboard, allowing you to choose different views and other functionality. Please refer to the CAT4 Dashboard page for full details