Adding another infix operator?(programing)

[Mark Stankus]

Hello,

  I am new to ginac. I have a computer algebra program which uses the
infix operator
"**" for a noncommutative multiplication (for example, a**b where a and
b are
symbols, but are thought of as representing matrices). 
(See http://math.ucsd.edu/~ncalg for more.)

  Is it possible/easy/hard to add a "**" infix operator to ginac?
If so, where do I start looking in the code to do this. I would
like to link my code up with ginac in the future.

Mark Stankus
mstankus at calpoly.edu