AntiFreeze is a utility with a very small footprint, sitting in your tray and waiting for you to press the hotkey combination (ALT+CTRL+WIN+HOME by default).
The AntiFreeze application should be used in emergency situations, consider it an alternative for the reset button.
As soon as you press the hotkey combination of AntiFreeze, AntiFreeze will suspend most of the running programs so they stop hogging your systems resources.
Then it will start a special type of task manager, very much like the standard Windows task manager except that it is designed for the particular task of letting you get the system in a responsive state again.