Brief History
Normally in the MS-DOS operating system, only one program can be running at any given time, and when it wants to stop running, it relinquishes the control to DOS's shell program, COMMAND.COM, using the system call INT 21H/4CH. The memory and system resources used by the program are marked as unused, effectively making it impossible to summon parts of it again without reloading it from scratch. However, if a program ends with the system call INT 27H or INT 21H/31H, the operating system does not reuse a certain specified part of the program's memory.
Read more about this topic: Terminate And Stay Resident
Famous quotes containing the word history:
“I believe my ardour for invention springs from his loins. I can’t say that the brassiere will ever take as great a place in history as the steamboat, but I did invent it.”
—Caresse Crosby (1892–1970)
“My good friends, this is the second time in our history that there has come back from Germany to Downing Street peace with honour. I believe it is peace for our time. We thank you from the bottom of our hearts. And now I recommend you to go home and sleep quietly in your beds.”
—Neville Chamberlain (1869–1940)