memory protection

(computer science) Any restriction on access to storage blocks, with respect to reading, writing, or both. Also known as memory protection.

A technique that prohibits one program from accidentally clobbering another active program. Using various different techniques, a protective boundary is created around the program, and instructions within the program are prohibited from referencing data outside of that boundary.

When a program does go outside of its boundary, DOS, Windows 3.x, Windows 95/98 and earlier personal computer operating systems simply lock up (crash, bomb, abend, etc.). Operating systems such as Unix, OS/2 and Windows NT, 2000 and XP are more robust and generally allow the errant program to be closed without affecting the remaining active programs.

Download Computer Desktop Encyclopedia to your iPhone/iTouch