[fowlplay4]

Well the program changes things in memory, so you make a script monitor important values, but V6 has some more anti-hack protections so this may not be as necessary.

I.e:
if (level == 1 && damage >= 9999) hacking();

Really you just need to understand how they work, and add a check to see if they're using that particular exploit. Usually done by removing functionality (I.e: random, freezeplayer, onwall).

Best way to avoid memory hacks is to avoid having important things calculated on the client-side, unless absolutely necessary.