ldm is an X11 display manager similar to xdm, gdm and kdm, but unlike those it wraps the X11 traffic within an SSH tunnel to provide a secure login mechanism for remote X sessions. ldm provides access only through SSH, not locally. It is technically possible to use ldm to connect to the same host, but probably a waste of CPU power. . It was written to work with the LTSP project, but should work without LTSP as well. . LTSP stands for 'Linux Terminal Server Project'.
