1) In computer programming, an exit program (or exit routine) is a named unit of programming code that is entered when a particular condition occurs, such as one that requires some screening for authorization. An exit program may be part of an operating system or part of an application program.
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2) In the IBM AS/400 operating system, an exit program is a supplemental security measure that controls user access to applications, and prevents access outside of authorized applications. An AS/400 exit program (so called because the system exits to the program in the middle of a request from the user) is not used - as might be expected - to exit from a program, but to process user requests: it monitors user activity, checks to see if user requests comply with installation rules, and rejects those requests that contravene those rules.