Spacetalk (not systemtalk two different channels there) prints to the full mud.
Note: This should most likely be removed from source or disabled because systemtalk does the same thing - and allows slicers to listen in on ship to ship communications with the commsystem skill.
*EDIT* In SWFotEFUSS its an admin level command. So, in light of that - guess its ok. Sorry for my stupidity in not looking at ced.