Logging in onto Athena:  X Window session.

Case 1: Normal session, with normal user files.	
  1. User executes xlogin and types username and password.
  2. Xlogin sources /etc/athena/login/Xsession.
  	3. /usr/athena/lib/init/xsession is sourced.
		4. ~/.cshrc is sourced
			5. /usr/athena/lib/init/cshrc is sourced
				6. Sets athena_path, hosttype, bindir,
				   athena_manpath, home.
				7. Setenv's MORE, EDITOR, VISUAL, RUSERHOME, 
				   MANPATH, LD_LIBRARY_PATH.
				8. Sources ~/.environment.
				9. Sources ~/.path, or sets path to
				   ($HOME/$bindir $athena_path .) .
				9. Sets prompt, history, cdpath, interactive.
				10. Aliases renew, term, mail, Mail, xresize,
				    logout, extend, add, setup, setup_X,
				    setup_tty, remove.
				11. Sources ~/.cshrc.mine
				12. Exit.
		13. Exit.
	14. Xrdb -merge ~/.Xresources.
	15. Starts window manager, mwm unless other is specified.
	16. Starts Dash, unless skip_dash is set.
	17. Creates logout button, unless skip_xlogout is set.
	18. Starts initial xterm, unless skip_initial_xterm is set.
	19. Starts zephyr clent, sends message of day, check for mail, and 
	    pings OLC server, all unless skip_x_startup is set.
	20. source ~/.startup.X.
	21. Prepares for logout with "exec session_gate -logout", sources 
	    ~/.logout.
	22. Exit.
  23. kdestroy, unlog, runs fsid -u -f $USER.
  24. Exit.


Case 2: Normal session, but "no customizations" selected.
  1. User executes xlogin and types username and password.
  2. Xlogin sources /etc/athena/login/Xsession, passing -nocalls.
	3. /usr/athena/lib/init/xsession is sourced, passing -nocalls.
		4. Sets shell to be tcsh.
		5. Sources /usr/athena/lib/init/cshrc
			6. Sets athena_path, hosttype, bindir, athena_manpath,
			   home.
			7. Setenv's MORE, EDITOR, VISUAL, RUSERHOME, MANPATH,
			    LD_LIBRARY_PATH.
			8. Sets path to ($HOME/$bindir $athena_path .) .
			9. Sets prompt, history, cdpath, interactive.
			10. Aliases renew, term, mail, Mail, xresize, logout,
			    extend, add, setup, setup_X, setup_tty, remove.
			11. Exit.
		12. sets WINDOW_MANAGER to mwm.
		13. Starts window manager.
		14. Starts dash with /usr/athena/lib/X11/app-defaults/Dash .
		15. Creates logout button.
		16. Starts initial xterm window.
		17. Starts zephyr clent, sends message of day, check for mail,
		    and pings OLC server.
		18. Prepares for logout with "exec session_gate", no source
		    of ~/.logout.
		19. Exit.
	20. Exit.
  21. kdestroy, unlog, runs fsid -u -f $USER.
  22. Exit.

Case 3: Heavy user customization.
  1. User executes xlogin and types username and password.
  2. Xlogin sources /etc/athena/login/Xsession.
	3. Xsession sources ~/.xsession.
	4. Follow customizations set in user's .xsession.

login sequence for tty:
  if you telnet, the receiving end runs /bin/login, which then exec's
  your shell with an initial dash in its name.  This forces the shell
  (usually /bin/csh) to read .login after picking up .cshrc
  the athena .login sources /usr/athena/lib/init/login
 
David Golombek (daveg), 1994, with base from Tom Yu (tlyu).