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This list of can be a predefined list of hosts and their respective network addresses, or a list that the XDMCP server in turn obtains by a network broadcast, which in effect most often mean that the list of hosts presented is limited to the local TCP/IP subnet, because that's how far a broadcast will travel. It is not uncommon for the host to present itself in this list, but then it presents
When selecting a host from the list, the X server running on the local machine will connect to the remote computers' X display manager such as XDM, GDM or KDM and open a window (an "X Terminal") for running a window manager or desktop on the remote machine, while the local machine only serve the actual graphical output and user input. Technically, the display manager listens to UDP port 177 and will respond to QUERY and BROADCAST_QUERY requests by sending a WILLING packet to the originator