memory overlay

memory overlay

[′mem·rē ′ō·vər‚lā]
(computer science)
The efficient use of memory space by allowing for repeated use of the same areas of internal storage during the different stages of a program; for instance, when a subroutine is no longer required, another routine can replace all or part of it.
References in periodicals archive ?
Consequently, data are always being moved into and out of memory overlays and disk storage, and performance diminishes due to the sluggishness of command processing, drawing generation, script interpretation, and other functions.