...resolution.2.01

There are about 150,000,000 receptors in the human eye, but only about 1,000,000 optic nerve fibers, so the number of ``pixels'' is several million, about that of a high quality computer monitor.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...well.''2.01

While a desktop user interface has been added to Unix and desktop-style applications are available for it, there is still a thriving Unix sub-culture that remains loyal to command-line oriented tools such as Knuth's TeX [22], the Emacs editor [38], wc for doing word counts, and so on. [34] Emacs is interesting as an example of a tool which goes well beyond the command line interface but in a direction entirely different from the desktop model. If the desktop model is a ``point and click'' interface, the Emacs model might be called a ``cut and paste'' interface. The user can capture text strings or sequences of keystrokes and combine them into powerful operations. If that is not sufficient, there is a complete implementation of Lisp that can be used to extend the system. This type of programmability is an area in which the desktop interface is notoriously weak. [16]

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...understands.2.01

In object oriented terms, the filter intercepts the input events and directly invokes the methods of the data object.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...limit2.01

[13], p. 627

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...policy''2.01

See [35], p. 7

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...technology.2.01

And, of course, improved hardware technology.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...bottom2.01

Often called front to back.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...release.2.01

Many systems use enter and leave events to achieve this functionality. Tab allows multiple simultaneous grabs of the event stream to achieve the same effect.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.