VKB-SIM

Im looking to see what all the acronyms mean on the STECS throttle some i can guess, some I have no idea about
Radio - most obvious of them - Radio
BRK - Break
OP EXEC = ?
OTS = ?
ENT = Enter?
RST = Reset?
MB1
and MB 2= ?
TRIG L Trigger left
TRIG R Trigger Right

They are likely meaningless in terms of function, more.justbto have something,rather than nothing, but...

BRK, Brake, as in speed
Op exec - operation execute?
OTS - on throttle slew?
MB1/2 - Mouse Buttons