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Understanding User Functions

User functions provide the means of implementing additional user processing within an existing function or as an independent implementation used in conjunction with an existing function. There are four basic user functions: Execute External Function, Execute Internal Function, Execute User Program, and Execute User Source.

Function

Action Diagram

Implementation

EXCEXTFUN

Yes

External

EXCINTFUN

Yes

Internal

EXCUSRPGM

No

External

EXCUSRSRC

No

Internal