9). The
user can disable keyboard grabs (Section 5.7), and then switch VTs using the keyboard
(Section 2.2).
If you??™re using X in a customer-accessible setting??”perhaps at the point of sale or on
a receptionist??™s computer??”a screensaver can reduce the risk that a customer will
view private or sensitive information. You may as well use the opportunity to convey
a message; several of the graphics hacks, such as fontglide, enable you used to present
text in an interesting manner. Hiding sensitive information on idle displays may be
required in regulated industries such as healthcare in some jurisdictions.
Current versions of GNOME and KDE, by default, do not use
xscreensaver. Instead, they provide their own screensaver utilities.
6.14 Redrawing the Screen
Once in a while, a bug in a client program (or, in rare cases, a buggy video card
driver) will cause it to leave artifacts in its windows??”dots, lines, or partial images
that shouldn??™t be there. If you encounter such a misbehaving application, you can
clean up the screen image by running xrefresh, which causes every client to redraw
itself:
$ xrefresh
xrefresh has no effect on composited displays.
112
Chapter 7 7
Running X Clients
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