Tcl/Tk help

nra@cix.compulink.co.uk asks
Question - how would you 'rlogin' and then specify the display on the
local workstation ?

  Answer: You set enviromental variable DISPLAY to point to display server machine
          and you enable the the display client to use your display by command:
          xhost <client_machine>.
   reference (e.g.) X window sustem user guide p 88 ( O. Reilly 1988)
                   (ISBN 0-937175-29-3 , info: nuts@ora.uu.net)