help on custom keypad

[manu aradhya <manu_aradhya yahoo co in>]

hi all, while progrmming on custom keyboard i am
trying to change the physical-key-to-keysym mapping.
   From the hardware, keyboard is generating some xy
keycode  before doing any operation on that keycode i
need to map it to my required keysym. For example: if
"A" is pressed then effect need to be equivalent to
down-arrow key.In key-snopper callback i tried to 
change the keyval of GdkKeyEvent according to my
reqirement but dint work for all the keys. is there
any way to register physical-key-to-keysym translation
table. any idea about this?
  thanx    
   -manu

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