The intermodule trace table begins with the characters INTER and contains the IDs of the last 20 modules that had control. The module IDs are the last 4 characters of the module name. For example, if the trace appears as follows:

INTER ... SA01 EX01 RI01 RI02

The intermodule trace table is updated by the system adapter not only as each module is entered, but also upon return from a module. Thus, if RI01 calls TP01 which calls IO01 and then returns back to RI01, the trace table appears as follows:

INTER ... RI01 TP01 IO01 TP01 RI01