Does anyone know what this is used for or what it means...?!

$address=@IPADDRESS0
IF (INSTR($address,"80")=0 AND INSTR($address,"40")=0)
...(some instruction)...
ELSE
GOTO "END"
ENDIF

Thanx...

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A l l Y o u r K I X A r e B e l o n g T o U s ! ! !