doc/ug using.xml

[jturney@sourceware.org]

CVSROOT:	/cvs/cygwin-xfree
Module name:	doc
Changes by:	jturney@sourceware.org	2010-10-23 12:45:11

Modified files:
	ug             : using.xml 

Log message:
	More help on getting DISPLAY set correctly for remote sessions
	More warnings about lack of security if using telnet

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/doc/ug/using.xml.diff?cvsroot=cygwin-xfree&r1=1.15&r2=1.16