b2b17b2c_6_6__The_X_Display_Manager__Description
[File] Xaccess [Description] 
The protocol for connecting to XDM is called the X Display Manager Connection Protocol (XDMCP) This file is a client authorization ruleset for controlling XDMCP connections from remote machines. By default, this file does not allow any remote clients to connect.
6.6. The X Display Manager
Description