On http://spacelink.nasa.gov/xh/ststle, it says to send a blank-subject message to listproc@spacelink.nasa.gov with message: subscribe STSTLE Firstname Lastname to be subscribed to a mailing list for STS TLEs. Under the heading "Where Am I?", http://spacelink.nasa.gov provides the first hierarchial stack of links on a tree I have ever seen. Very nice. Cheers. Walter Nissen