It's also useful to change the color of channels as you see
them. Here's the three color commands for channels :
color <channel> bright <color>: Change the color
  of channel to bright color
color <channel> dark <color>: Change the color
  of channel to dark color
color reset: Reset all channels to their original colors.
The color argument can be either the name of a color
(ie. green) or the color command for it (ie. {g).

Another part of formating the display is changing the data
shown in the prompt. Originally your prompt shows only hit
points, mana points, and movement points. You can change it
with the following commands :
%h : Display your current hits
%H : Display your maximum hits
%m : Display your current mana
%M : Display your maximum mana
%v : Display your current moves
%V : Display your maximum moves
%x : Display your current experience
%X : Display experience to level
%g : Display your gold held
%b : Display breath/blood points
%a : Display your alignment
%r : Display the room name you are in
%e : Display the exits from the room in NESWDU style
%c : Display a carriage return (useful for multi-line prompts)
%p : Display your position in short form
%P : Display your position in full form
You change your prompt by typing prompt <%*>.
%* is any of the multiple variables listed above and
the spacing and words to display afterward.
Ex. : prompt <%hhp/%Hhp %mm/%Mm %vmp/%Vmp>
will set your prompt to : <5hp/10hp 5m/10m 5mp/10mp>
Typing prompt all will produce the standard
<hit mana movement> prompt.

The final two commands in customizing the display are
brief and compact.
Brief will toggle seeing room descriptions on and off.
Compact will remove the extra line after the prompt.