Xnest works by forwarding requests made of the nested server to the parent server.
An alternative approach is offered by Xephyr, a server that renders onto an X image
displayed in a window. The net effect is similar, but Xephyr can support extensions
that are not provided by the parent server. It can also be used to build a multiseat
solution.
2.12 No Mouse!
When testing and configuring an X server, it??™s not uncommon to find yourself without
a working mouse. If your keyboard is working, though, there is a way to cope.
Figure 2-1. A KDE session in a window within a Gnome session
2.12
38 Chapter 2: Starting a Local X Server
The X.org server (and some others) provides mouse keys capability, which permits
the mouse pointer to be moved using the keypad. To toggle mouse keys mode on or
off, press Shift-NumLock.
In this mode, the keypad buttons perform mouse actions, as illustrated in Figure 2-2.
The operation of the mouse buttons requires an explanation:
??? Pressing the 5 key is equivalent to clicking a mouse button once.
??? Pressing the 5 key twice in a row or pressing the + key is equivalent to doubleclicking
a mouse button.
??? Pressing the 0 key holds a mouse button down (useful for drag operations), and
the .
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