GDM is the GNOME Display Manager, it is the little proggie that runs in the background, runs your X sessions, presents you with a login box and then tells you to piss off because you forgot your password. It does pretty much everything that you would want to use xdm for, but doesn't involve as much crack. It doesn't use any code from xdm, and has a more paranoid and safer design overall. It also includes many features over xdm, the biggest one of which is that it is more user friendly, even if your X setup is failing. The goal is that users should never, ever have to use the command line to customize or troubleshoot gdm. It of course supports xdmcp, and in fact extends xdmcp a little bit in places where I thought xdm was lacking (but is still compatible with xdm's xdmcp).

News:
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Highlights of 2.6.0.4:

- Allow not checking directory owners with CheckDirOwner key,(Andreas Schubert)

- FreeBSD support for VTAllocation stuff (Alexander Nedousukov)

- Add de_AT, de_CH, fr_BE, fr_CH, hy_AM to language list (#148349, #139454)

- Add more native versions of language names and fix up existing ones, #148373, #148486, 148356, #148350, #88777, #150293

- Add support for Solaris logindevperm and usiting (Brian Cameron)

- Fix some strings, fixes #144076, #144077, #147800

- On sun we automatically make the default config add -nobanner to
the X server flags (Arvind)

- Fix doubleclicking on the user browser in the standard greeter

- Fix #144007 where bad .profile could screw up a session start

- Fix #148042 by making GETTEXT_PACKAGE just gdm

- Fix #147940 by properly checking if shutdown/reboot/suspend commands exist
in the graphical greeter

- Fix #143707 by using Exclude key for the user dropdown lists in gdmsetup

- Fix some compiler warnings for new gcc

- .dmrc is created with umask 077 for maximum anality

- Translation updates (Kjartan Maraas, Laszlo Dvornik, Laurent Dhima, Martin Willemoes Hansen, Marie Lund, Metin Amiroff, Francisco Javier F. Serrador, Duarte Loreto, Tommi Vainikainen, Leonid Kanter, Changwoo Ryu, Funda Wang, Artur Flinta, GNOME PL Team, Miloslav Trmac, Adam Weinberger, Estevao Samuel Procopio, Tommi Vainikainen, Danilo Segan, Guntupalli Karunakar, Lucas Vieites, Christian Neumair, Nikos Charonitakis, Gustavo Maciel Dias Vieira, Afonso Celso Medina, Sebastien Bacher, Ole Laursen, Ivan Stojmirov, Andras Timar)