exit program
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.
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.
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