4) and
XDMCP broadcasts (Section 13.5): a single host is designated as the host that
decides which X server should connect to which XDMCP server. By default, that one
system will broadcast a query to the network and present a graphical chooser to the
user. When the user selects one of the available hosts, the X server and XDMCP
server directly communicate, and the user is presented with an authentication dialog.
This technique is called an indirect query and is invoked with the -indirect host
option on the X server command line. If the indirect host is red, you can send it an
indirect query like this:
blue$ X :8 -indirect red
The appearance of the chooser display??”the menu from which the user selects a
host??”varies according to the display manager in use on the indirect host. Figures
13-1 through 13-3 show the appearance of the standard choosers from XDM, GDM,
and KDM hosted on a Fedora system.
Notice that in each case, the user is able to select a host by clicking on it. The hostname
and status message come from each XDMCP host and may be customized; the
host picture, if any, comes from the indirect host.
When the user selects a host, the indirect host instructs the X server to connect to
that host, which it does directly.
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