Definition: Rebooting a BlackBerry by holding down the ALT + CAP + DEL keys.
A soft reset is a basic troubleshooting step that may resolve many minor BlackBerry software issues. Rebooting your BlackBerry on a regular basis may eliminate the need to perform soft resets.
The BlackBerry will also allow you to perform a double soft reset. To perform one, hold down the ALT + CAP + DEL keys, and when the BlackBerry screen lights up during the reboot process, hold down the ALT + CAP + DEL keys again. A double soft reset may solve software issues on the BlackBerry that a normal soft reset will not.