GDDM V3R2 Base Application Programming Guide
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Finding errors in GDDM-REXX programs

GDDM V3R2 Base Application Programming Guide
SC33-0867-01
Sometimes, GDDM may interpret incorrectly specified parameters in unexpected ways, without giving an error message. If you get unexpected results, try tracing. Put 'GXSET TRACE ON' before the call that is giving trouble, and 'GXSET TRACE OFF' after it.
The trace will show the values GDDM-REXX got, and the values it sent on to GDDM.

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