All communication is lines of ASCII text (terminated by newline).

Request is sent by client as a single line of text:

REQUEST := username <NAME> | userid <NUM> 

	<NAME> is a username (login name), this should be a sequence of
	at most 8 ASCII alphanumeric characters ([a-zA-Z0-9])

	<NUM> is a userid, this should be a sequence of at most 5
	numeric characters ([0-9])

Examples of valid requests:

username hollingd

userid 1234

The response sent back by the server is a single line of text 
terminated by a newline. 

RESPONSE := ERR <ERRMSG> | OK <FULLNAME>

if the server is unable to respond with infomation about the request
(a valid user's name), the server sends back a string starting with
the substring "ERR". The remainder of the line contains an error message
(could contain anything).

if the server can find a user corresponding to the request, the server
sends a single line of text starting with "OK" followed by the user's
full name (the value of the pw_gecos field in the password database).

Example responses:

ERR no such user
ERR unrecognized command
OK Joe Schmo