Re: Hey, can they TALK 2 Each other?????
Hello Carl,
Kind of...
"NASA's involvement with the mission includes joint development of the radar instrument with the Italian space agency; support of U.S. science co-investigators; coordination of radio relay systems to make sure that different spacecraft will operate with each other; a hardware contribution to the energetic neutral atoms analyzer instrument; and the provision of backup tracking support during critical mission phases by NASA's Deep Space Network."
http://mars.jpl.nasa.gov/missions/future/express.html
Lots of good links to explore.
See ya, VINCE