Emacs as a window manager, toolkit server, and tty window server, and
selection service. 

It should function as a programmable window manager. It should perform
all the functions of uwm: icon and window placement and sizing,
program invocation, etc...

It should perform the functions of a toolkit manager, by providing
interactive toolkit widget services, such as menus, scroll bars,
type-in windows, display gadgets, and other graphical input/output
devices. 

It should provide a terminal emulator window service, to store buffers
of text, or other information, such as display lists, and display them
by translating them into window system calls. It can pre-process
certian user input, and should handle window damage repair for its
clients.

It should perform selection services, managing the cut buffers,
allowing the user to load them, edit them, move them around, and apply
functions to them.

It should be extremely modular, programmable, and flexable. 

Much of this is obviously quite insane.