Xconfig is the master configuration file used by dtlogin. It sets login resources and specifies locations of additional files required by dtlogin. The following example shows a few of the lines found in the default Xconfig file:
Dtlogin.errorLogFile: /var/dt/Xerrors
Dtlogin.servers: /usr/dt/config/Xservers
Dtlogin*session: /usr/dt/bin/Xsession
For more information about this file, refer to Appendix A, dtconfig(1) Man Page. You can also review the explanatory comments in the file itself.