Kilowatt Software L.L.C.
Classic Rexx Tutorial
Language Level 4.00 (TRL-2)

Trace   built-in function

The Trace function returns the current Rexx trace setting, and optionally alters the trace setting.

The setting can be preceded by a question mark character ('?'). This has the effect of toggling the interactive trace facility. If interactive tracing was active, it is deactivated. If interactive tracing was inactive, it is activated.

Trace settings are also adjusted by the trace instruction. The description of the trace instruction further describes the trace facility.