X.Org7.0,7.1,7.2都可以用Xserver1.3,所以Fedora core6,Fedora core7, Fedora core 8用X -version命令查看的话显示的结果都是：
[root@localhost rstart]# X -version
X Window System Version 1.3.0
Release Date: 19 April 2007
X Protocol Version 11, Revision 0, Release 1.3
但是同样的命令在PClinuxOS或者Ubuntu某些版本上查看的话，如果是最新版结果就是 X.org X11 release 7.3之类的显示。
之所以有这两种显示的结果，原因如下：
"Xorg" Includes the Xserver + Drivers etc.
They are all using the same.
Xorg 7.2 = All stuff + Xserver 1.2
Xorg 7.3 = All stuff + Xserver 1.4
Xserver 1.3 is mentioned because not all Xorg 7.2 distributions have it, because it is an update.
