multi programming system

Multi-access means more than one user can access the same resources whereas multiprogramming means two or more programs runs concurrently.

Multiprogramming is a technique for hadling the execution of two or more programs simultaneously by interleaving or overlapping their execution. This system operates on the basis of i/o interrupt concept. IN this there are two distinctive functional units One is control unit and anothr is i/o control unit. System takes up program one for processing and continues it till and i/o operation is encountered then the control is transfarred to i/o control unit. In this system one program can be executd at the same time but since the switchover is accomplished very fast that user feels that all programs are running concurrently.