A service program is a type of program object that's different from the traditional programs (also known as OPM or Old Program Model) that AS/400 programmers grew up with.  In shortest terms, you can combine ILE modules into a single program that has many entry points.  For a VERY quick introduction, you might want to take look at one of Scott Klement's presentations:

https://www.scottklement.com/presentations/ILE%20Concepts%20(For%20The%20Impatient%20RPG%20Programmer).pdf

But to understand in any real detail, you'll need to review the ILE (Integrated Language Environment) basics.  You can start here, with the ILE Concepts manual:

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_73/ilec/sc415606.pdf

This is probably a lot more than you want to know, but it's what the IBM i community means when they refer to service programs.



On 2/28/2019 12:44 PM, Debbie Panco wrote:
What is a service program? Is that a program that interfaces between the web and the
AS400? As in the AS400 calls the service program which writes the data to the web,
receives it back and passes it back to the awaiting AS400 program?


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