Electronic mail transmitted between millions of users connected on networks worldwide. Messages are exchanged instantaneously, usually at zero marginal cost to users, thereby saving greatly on national or international telephone and express mail fees. Messages may be stored in computer files and processed at a user's convenience. Precautionary advice is given under ActiveX . (See also Internet , Internet Messaging , SLIP , and USENet )
I wrote the following at http://WWW.Trinity.edu/rjensen/bookurl.htm#071498