The intrinsic mechanism allows applications to call system-defined functions. The mechanism is implemented differently for each application language. (Refer to the appropriate programming language user's manual for details.)
The CI can be invoked from an application program by using the HPCICOMMAND or COMMAND intrinsics. The HPCICOMMAND intrinsic activates the CI to execute the command identified in the intrinsic's parameters. Any built-in MPE command, UDC, or command file can be executed this way. When completed, control is returned to the calling program. The COMMAND intrinsic works in a similar manner, but only built-in MPE/iX commands can be executed.
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