RhayaderR FL ZThu Nov 19 17:12:12 1998 It's R FL Z. And, yes, it's a toggle :) The FL part is to tell SoftICE that we want to change FLag register. And, since flag is a Boolean value (only ON or OFF), it works as a toggle switch. HTH.BTW, other flag command worth knowing is R FL C (for JC and JNC), R FL S (for JS and JNS).Keep smiling,Rha