The IFDEF Tag

    Syntax: {IFDEF::Tag name::true::false}
    Function: If there exists a tag with the specified tag name (argument 1), PReP follows the instruction in "true" or otherwise in "false
    Example:

    {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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