If you use the FTL setup you can make your macros, that you don't want to happen locally, start with:

Code:
/stopmacro [nomod]
And use hotstrings to send a modified version of the key to the other machine.

1 --> ctrl alt 1

So the other machine gets ctrl alt 1 and the script realizes from this which character sent the 1 key. (yes the computer actually 'realizes' 8)

but since you did not use a mod key on the local machine the macro stops executing on the first line.

with two machines the FTL setup is fairly quick and simple once you wrap your wits around it.