INADVERTENT ACTIVATION OF TOGA DURING LNDG ROLL ON A B777 AT THE END OF A LONG INTL FLT.

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ALL NIGHT FLT FROM MIA TO EZE. COPLT LANDED. I TOOK CTL AT 80 KTS. I LOWERED THE THRUST REVERSER LEVERS. I AM NOT SURE WHAT I DID; BUT I KNOW THAT I MOMENTARILY MOVED MY HAND FROM THE THROTTLES. THE FATIGUE CAME IN TO PLAY NEXT BECAUSE WHEN I PUT MY HAND BACK SOMETHING WAS NOT RIGHT; BUT I WAS NOT SURE WHAT IT WAS. MY HAND WAS HANGING THERE AND I FELT THAT IT WAS SUPPOSED TO BE RESTING ON SOMETHING; SO I PUT MY HAND ON MY R ARMREST. ABOUT THEN; THE WARNING HORN STARTED AND THE FLAP CONFIGN EICAS WARNING CAME ON. I STILL DID NOT REALIZE WHAT WAS GOING ON. THAT WAS WHEN I SENSED A SMALL ACCELERATION AND THE FATIGUE DID NOT MATTER BECAUSE INSTINCT TOOK OVER. MY HAND WENT FORWARD; GRABBED THE THROTTLES AND BROUGHT THEM TO IDLE. I DISCONNECTED THE AUTOTHROTTLES. THIS IS MY BEST GUESS ABOUT WHAT HAPPENED. SOMEHOW I TOUCHED THE TOGA SWITCHES ON THE FRONT SIDE OF THE THROTTLES. ON THE B777 THESE WILL ONLY ENGAGE BELOW 50 KTS ON THE GND. MY FLT HOME WAS A SCHEDULED DEADHEAD ON A B767 SO I HAVE NOT BEEN ABLE TO LOOK AT THE THROTTLE GEOMETRY SINCE THEN TO SEE HOW EASY IT WOULD BE TO CASUALLY TOUCH THESE SWITCHES. ALSO; I DO NOT KNOW IF THE SENSITIVITY OF THE SWITCHES IS ADJUSTABLE AND I HAPPENED TO HAVE SOME SUPER-SENSITIVITY SWITCHES. IF I ENGAGED THE AUTOTHROTTLES WITHOUT KNOWING IT; I AM SURE THAT SOMEONE ELSE COULD DO IT TOO. ANYWAY; HAVING ENGS THAT COULD UNEXPECTEDLY GO TO 90000 LBS OF THRUST ON A TXWY OR IN THE RAMP AREA MIGHT AT LEAST REQUIRE A WARNING IN THE OPS MANUAL. THE OTHER THING ABOUT THE FATIGUE WAS THAT I REALLY DID NOT THINK CLRLY ABOUT WHAT HAPPENED UNTIL I HAD GONE TO THE HOTEL AND SLEPT FOR ABOUT 6 HRS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR HAS EXTENSIVE EXPERIENCE IN MCDONNELL DOUGLAS ACFT THAT HAS A DISSIMILAR TOGA ACTIVATION SWITCH. AFTER FURTHER THOUGHT AND INVESTIGATION OF THE POS OF THE SWITCH ON THE B777; HE STATED THAT HE PROBABLY ACTIVATED THE SWITCH INADVERTENTLY DUE TO HIS FATIGUED CONDITION COMBINED WITH HIS RELATIVE INEXPERIENCE IN THE ACFT.