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page 132

-Shared definitions makes software very portable between machines. (The quantity of public domain software is huge).

-The user interface is very similar when going between different X-Windows based machines.

-Easy to Customize for an individual user

-The differences between systems like Motif and Openwindows are mainly based on definitions of things like buttons, fonts, etc.

-When using X-Windows, a program (called the X server) runs which controls all the windowed graphics. Programs that use X are written to let it set up buttons, get input, call functions, etc.

-etc.

Windows NT is not yet as capable as X-Windows, but if the trend continues it will become more similar over time.

Automatic GUI generators are available on commercial systems. One example is given for a system which allows window layout, then automatic program generation.

DI:15.9 PRACTICE PROBLEMS