Elements of windowing systems.
a)Device independence.
-Programming the abstract terminal device drivers.
-Image models for output and (partially) input.
• Pixels.
• PostScript (MacOS X, NextStep).
• Graphical Kernel System (GKS).
• Programmers' Hierarchical Interface to Graphics (PHIGS).
b)Resource sharing.
– Achieving simultaneity of user tasks.
– Window system supports independent processes.
– Isolation of individual applications.
jim items answered the question on March 15, 2019 at 08:02
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