Syntax:
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{IFDEF::Tag name::true::false}
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Function:
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If there exists a tag with the specified tag name (argument 1), PReP follows
the instruction in "true" or otherwise in "false
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Example:
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{IFDEF::ANYTAG::this tag exists!::this tag does not exist!}
If ANYTAG exists, PReP will return "this tag exists!" and otherwise "this tag does not exist!"
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