,----[ From the Tutorial (see `C-h t' oder help menu) ]
| Most Emacs commands accept a numeric argument; for most commands, this
| serves as a repeat-count. The way you give a command a repeat count
| is by typing C-u and then the digits before you type the command. If
| you have a META (or EDIT or ALT) key, there is another, alternative way
| to enter a numeric argument: type the digits while holding down the
| META key. We recommend learning the C-u method because it works on
| any terminal. The numeric argument is also called a "prefix argument",
| because you type the argument before the command it applies to.
The tutorial probably is something that every Emacs user should read.
In (info "(emacs)Arguments"), which is the first match if you do an
index search for `C-u', you'll probably find answers to all your
questions raised above.
---ooO-(_)-Ooo--- PGP key available via WWW http://www.yqcomputer.com/