Just to expand on something that AFSKAP mentioned. 'To Recall of any cancelled Master Caution warnings'. Basically if you have any yellow caution light on anywhere in the flight deck (except the forward panel, coz thats where your eyes are) then pressing recall will illuminate the system that has a problem. Useful at TOD when you have had a problem en-route as a reminder and also after start when a system may not have been set correctly (cue yaw damper or something similar...)