HP RPG/XL Programmer's Guide (30318-90001)

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Figure 8-3. A More Complex UDC
Using System Intrinsics
System intrinsics are operating system routines that perform specific
tasks. For instance, the PAUSE system intrinsic temporarily stops a
program. This intrinsic may be used, for example, to give an operator
time to mount a tape. It is often useful and convenient to use
intrinsics when you need to perform similar functions in your program.
Intrinsics provide a way to gain more control over processing and they
simplify a program. Although you cannot use system intrinsics directly
from an RPG program, you can use external subroutines to access them.
Intrinsics are described thoroughly in the MPE XL Intrinsics Reference