HP 3000 Manuals

HP TRANSACT Quick Reference Guide

Conditional Compile Commands 
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     !SET Xn={ON/OFF}
     !IF Xn={ON/OFF}
     !ELSE
     !ENDIF
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Example 

     !IF XL=ON
         FILE=MYFILE((HP3000_16));
     !ELSE
         FILE=MYFILE;
     !ENDIF
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MPE/iX 5.5 Documentation