 If the input providing the attack vector into which the NOP slide and payload are to be introduced are filtered (such as accepting only printable characters), the field of possible instructions for inclusion is limited.While instructions that are part of an architecture extension (such as SSE) may frequently be irrelevant to program state, they cannot be used in a NOP slide targeting a computer on which the extension is not supported.Many techniques exist to detect the presence of NOP slides in memory.