Making chars disappear

[J Gillespie]

Does anyone know of a way to prevent characters being echoed as they
are typed in?  Like when you log in, your password doesn't get echoed.
I have a nasty feeling this may involve sending control codes to the
terminal.

-- 
  James Gillespie,     /~~~~~~~~\
 Edinburgh University /   @  @   \ "Oh wow.  What a bummer."
   james at ed.ac.uk    /     <      \		-- Truman Sparks, _Fandango_
____________________/  \________/  \__________________________________________