What is the shortcut for performing warm booting ?

Booting is the process of starting or restarting a computer so its operating system loads into memory. A warm boot (sometimes called a soft boot or soft reset) restarts the computer through software while it is already powered on, rather than switching the power off and on again. On systems that use this operating system, the standard keyboard shortcut for triggering a warm boot is holding down the Control, Alt, and Delete keys together, which brings up a system menu that allows the user to restart, log off, or open the task manager.

Holding only Control and Alt together does not perform any restart action on its own; it is simply an incomplete combination that does nothing by itself. Holding Control, Alt, and F1 together is generally used on Unix-like systems to switch to a different virtual console or terminal screen, not to reboot the machine. Holding Control and Delete together also has no defined warm-boot function on its own, since the Delete key in that pairing typically performs a different editing action rather than triggering a system restart.

Remembering the full three-key combination matters here: warm booting specifically requires Control, Alt, and Delete pressed together, and leaving out any one of these keys changes or removes the restart function entirely.