The most common implementation of virtual memory, in which pages of data are read into main memory from an auxiliary storage device only in response to interrupts that result when software requests a memory location that the system has saved to auxiliary storage and reused for other purposes. Short for demonstration. A partial or limited version of a software package distributed free of charge for advertising purposes.
Demos often consist of animated presentations that describe or demonstrate the program's features.
See also crippled version. A computer in a store that is available for customers to test, to see if they wish to buy it. A prototype that shows the on-screen look and sometimes the proposed capabilities of a program under development. See also prototyping. A scaled-down version of a proprietary program offered as a marketing tool.