Using the Windows Task Manager (XP)
You might not know it, but the Windows Task Manager is a very familiar tool. Each time you press the common Ctrl – Alt – Delete command, you call up the Windows Task Manager. It displays information about programs and processes running on your computer. It also shows you data on CPU and memory usage and user information.
To open the Windows Task Manager, right-click on an empty part of the task bar and select Task Manager, or you can press Ctrl – Alt – Delete.
Under the Applications tab, you’ll see all the programs that are currently running on your computer. If a program has stopped responding, you can end the program by selecting it and hitting the End Task button.
Under the Users tab, you can see who is connected to your computer and send them a message