ILE RPG supports the use of the following special routines using the CALL and PARM operations or the CALLP operation:
Note: You cannot use the CALLB operation to call these special subroutines.
You can use CALLP if you define a prototype for the subroutines. While the message retrieval routine is still supported, it is recommended that you use the QMHRTVM message API, which is more powerful.
Similarly, the routines SUBR40R3 and SUBR41R3 are being continued for compatibility reasons only. They will not be updated to reflect the level of graphic support provided by RPG IV via the new graphic data type.
IBM - RPG Related Interview Questions
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Ibm - Rpg Tutorial
Overview Of The Rpg Iv Programming Language
Rpg Programming In Ile
Program Creation Strategies
Creating An Application Using Multiple Procedures
Using Source Files
Creating A Program With The Crtbndrpg Command
Creating A Program With The Crtrpgmod And Crtpgm
Creating A Service Program
Running A Program
Calling Programs And Procedures
Rpg And The Ebusiness World
Obtaining A Dump
General File Considerations
Accessing Database Files
Accessing Externally Attached Devices
Using Workstn Files
Example Of An Interactive Application
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