Vertical Blocks

[Kouros Owzar]

Hi.

How does one go about marking, for the purpose
of copying, pasting or cutting, vertical blocks (regions)
in emacs?

To be more specific, how does one mark columns 5 to 7 within
rows 2 to 6?

How does one toggle back and forth from horizontal to vertical
block selection?

Sincerely,

Kouros

"Peace, commerce and honest friendship with all nations; entangling alliances
 with none." --Thomas Jefferson: 1st Inaugural Address, 1801.

The Declaration of Independence:
http://www.archives.gov/exhibit_hall/charters_of_freedom/declaration/declaration_transcription.html