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built in pssys (think about this)
  an easy way to manage command line driven programs
  multiple shell windows to a client
  connected to each by socket -- popen() or whatever
  write on socket: goes to stdin of shell (use -input flag)
  read from socket: comes from stdout of shell (use -output flag)

When the process talking to a terminal window goes away, the terminal
window should not immediatly dissappear. The user may still want to
select text off of it. There should be a way to save the contents of
the window to a file. Extend it to work with a growable array of lines
and scroll bars. Put max and min to scroll bar window everywhere, make
sure loops through the lines all cancel out right. Just translate to
handle the x scrollbar offset. Display the whole lines and let the
window system worry about the horizontal clipping. 

Should selection should ignore trailing blanks on a line string if the
strings are all the screen width long? Or should do we need to store
line length? 
Need lines of arbitrary length. 
An array of line string subintervals that parallels the array of screen
width line string. 

How can we handle variable width fonts?
Arrays of character x in pixel coordinates that parallel the line strings.

Function keys to operate the scroll bars.
Popup function key help window. Allows you to rebind keys, too.
Escape codes to bind keys, create conrol panel buttons, menus, etc.
Scroll bar, function keys, etc, send events that can be journaled.
Use function keys to invoke termulator commands. (as well as menus)
Save state function. (makes file that can be read in upon initialization 
to clone this terminal)
Make some of these modules autoloaded. Auto-unloaded, when not used for
a while?