a & b ;
if true : will give a, then '!' will give 0 and the second '!' will give 1.
if false: will give 0, then '!' will give 1 and the second '!' will give 0.
edit : @Kitami : just tested, it works fine for me. I've removed 'm' in users.ini ; changed 'a' to 'm' in the plugin, and when I'm on the server, I don't have the speed. I've debugged too, nothing wrong.