About CUA mode

[Xue Fuqiao]

This page (http://en.wikipedia.org/wiki/IBM_Common_User_Access) says that:

  The Cut command is Shift+Del; Copy is Ctrl+Ins; Paste is Shift+Ins;

But in cua-mode, `C-x', `C-c', `C-v', and `C-z' invoke commands that cut
(kill), copy, paste (yank), and undo respectively.  Why?  I went to the
website of Kim F. Storm and `cua-base.el', but I still don't know.  Can
somebody give some background?

--
Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/