viper: Marking
4.2.2 Marking
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Emacs mark is referred to in the region specifiers ‘r’ and ‘R’. 
Emacs Preliminaries, and Basics, for explanation. Also see
Mark (emacs)Mark, for an explanation of the Emacs mark ring.
‘m<a-z>’
Mark the current file and position with the specified letter.
‘m .’
Set the Emacs mark (Emacs Preliminaries) at point.
‘m ^’
Set the Emacs mark (Emacs Preliminaries) back to where it
was last set with the ‘m.’ command. This is useful when you set
the mark with ‘m.’, but then some other command (such as ‘L’ or
‘G’) changes it in a way that you didn’t like.
‘m <’
Set the Emacs mark at beginning of buffer.
‘m >’
Set the Emacs mark at end of buffer.
‘m ,’
Jump to the Emacs mark.
‘:mark <char>’
Mark position with text marker named <char>. This is an Ex
command.
‘:k <char>’
Same as ‘:mark’.
‘``’
Exchange point and mark.
‘''’
Exchange point and mark and go to the first CHAR on line.
‘'<a-z>’
Go to specified Viper mark.
‘`<a-z>’
Go to specified Viper mark and go to the first CHAR on line.
Info Catalog
viper: Move Commands
viper: Text Handling
viper: Appending Text