Multitasking enables you to open many applications simultaneously, although this usually results in many processes hogging the CPU. Sometimes a single active process takes up so many resources that the whole system becomes unstable and may end up freezing.
You can use Process Tamer to prevent these situations. It's a small tool that sits unobtrusively in Windows system tray and controls all active processes. As soon as any of them goes beyond the limits you set in the program's configuration settings, Process Tamer will lower its priority and therefore get the situation back to normal.
The program's options enable you to set the threshold of reaction, which is based only on CPU activity (no RAM memory, for example). You can also set rules and filters applied to specific applications.