Application programming for IMS TM

IMS provides support for writing application programs to access IMS transactions.

Defining application program elements for IMS TM
You can write application programs to communicate with the IMS Transaction Manager using DL/I calls in assembler language, C, COBOL, Java™, Pascal, or PL/I.
Message processing with IMS TM
IMS Transaction Manager application programs can be written in assembler language, C language, COBOL, Pascal, and PL/I to process messages.
IMS Spool API
The IMS Spool API support provides feedback to the application program when IMS detects errors in the print data set options of the CHNG and SETO calls.
IMS Message Format Service
The IMS Message Format Service (MFS) is a facility of the IMS Transaction Manager environment that formats messages to and from terminal devices, so that IMS application programs do not deal with device-specific characteristics in input or output messages.
Callout requests for services or data
IMS applications can issue callout requests for services or data, and optionally receive responses back in the same or a different transaction, through IMS Connect and OTMA. The request for services or data is a callout request.