EECS 1012 Lecture Notes - Lecture 17: Display Server, Graphical User Interface, Local Area Network
13 Jun 2018
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EECS 1012 Lecture 17 Notes
Introduction
Display operations
• Essentially, the display server can perform many of the basic display operations with
very little communication required.
• WYSIWYG text, for example, requires only that the choice of font, the display location,
and the actual text data be transmitted.
• The font data is stored at the display server.
• The server also provides a library of all the basic tools and widgets to draw windows
provide drop-down menus, present control buttons, respond to mouse clicks, and many
other functions.
• This method requires far less data communication between the program and the display
than if the transmission of actual text images and windows were required.
• X Window places no restrictions on the location of the client application
• Therefore, the application program could reside on the same computer system as the
display server or remotely on a different system.
• Furthermore, the display server can process requests from several different client
applications concurrently, each in its own window.
• You would expect this to be true, since a graphical user interface can have several open
windows at one time.
• This leads to an interesting and exciting possibility
• Those different windows on a single display could be communicating with application
programs on different machines! Indeed, this is the case.
• The picture illustrates this situation.
• The window in the upper-left corner is communicating with a program located on the
same PC with the display.
• The PC is running an X Window server under Microsoft Windows.
• The other windows on the screen are connected to various systems located remotely
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