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Preprocessor variables begin with the string “$PRE.”. They are created and updated with the PDM_SET tag. This tag has the following syntax when used with a preprocessor variable:
<PDM_SET PRE.name[+]=value>
This tag assigns or updates a preprocessor variable, creating it if necessary. It is processed when the web engine encounters it while reading a form. Only the invariant PDM_IF statements affect PDM_SET of a preprocessor variable; others are ignored.
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