vip: New Bindings
1.4.9 New Key Bindings
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In VIP the meanings of some keys are entirely different from Vi. These
key bindings are done deliberately in the hope that editing under Emacs
will become easier. It is however possible to rebind these keys to
functions which behave similarly as in Vi. 
Customizing Key
Bindings, for details.
‘C-g’
‘g’
In Vi, ‘C-g’ is used to get information about the file associated
to the current buffer. Here, ‘g’ will do that, and ‘C-g’ is used
to abort a command (this is for compatibility with emacs mode.)
‘SPC’
‘<RET>’
Now these keys will scroll up and down the text of current window.
Convenient for viewing the text.
‘s’
‘S’
They are used to switch to a specified buffer. Useful for
switching to already existing buffer since buffer name completion
is provided. Also a default buffer will be given as part of the
prompt, to which you can switch by just typing <RET> key. ‘s’ is
used to select buffer in the current window, while ‘S’ selects
buffer in another window.
‘C’
‘X’
These keys will exit from vi mode and return to emacs mode
temporarily. If you type ‘C’ (‘X’), Emacs will be in emacs mode
and will believe that you have typed ‘C-c’ (‘C-x’) in emacs mode.
Moreover, if the following character you type is an upper-case
letter, then Emacs will believe that you have typed the
corresponding control character. You will be in vi mode again
after the command is executed. For example, typing ‘X S’ in vi
mode is the same as typing ‘C-x C-s’ in emacs mode. You get the
same effect by typing ‘C-x C-s’ in vi mode, but the idea here is
that you can execute useful Emacs commands without typing control
characters. For example, if you hit ‘X’ (or ‘C-x’) followed by
‘2’, then the current window will be split into 2 and you will be
in vi mode again.
In addition to these, ‘ctl-x-map’ is slightly modified:
‘X 3’
‘C-x 3’
This is equivalent to ‘C-x 1 C-x 2’ (1 + 2 = 3).
Info Catalog
vip: New Commands
vip: Differences from Vi
vip: Window Commands