From Coldbear's reply above - "1) Low speed RTO, GS below 80kts witch is where you would stop for all malfunktions. Doing this part you must disconnect the A/T because it's still in THR REF.2) High speed RTO, GS above 80kts. This is the more serius one and normally you would only stop for an engine failure, fire or a master warning. Doing this stage you shall just retard the thrust lever and bring it into revers(max or idle depending on runway lenght and RTO speed). monitor the autobrakes and steer the aeroplane. Call ATC tell them what your doing and if nessecery(sp?) evacuate on the runway."