Screen Sharing
Many system administrators and power users prefer to operate from the command shell, where a single line of text maps neatly to a single response. The command shell is also easy to extend to a remote execution environment, using tools such as Telnet, rsh, and SSH. However, most users don’t operate from the shell prompt anymore. Most users like to operate by clicking with a mouse in a graphical user interface.
The task of providing remote access through a graphical user interface is a bit more complicated, but the philosophy is the same (see Figure 15.4). A software component operating at the Application layer of Computer A intercepts keyboard input and redirects it through the protocol stack to Computer B. Screen output data from ...
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