'\^Q' as an escape for control characters

[reb at nbires.UUCP]

In the internal documentation for Gosling's EMACS, it mentions that EMACS'
use of '\' in character strings follows that of C, but then goes on
to give an example for control-X as the **three** char sequence \^X !

K&R makes no mention of this notation and our C compiler (4.1BSD)
does not accept it, as the two character sequence ^X is produced.

Does anybody know if this is a new/future extension to C, available only
in some implementations of C, an error in the EMACS documentation,
an EMACS extension, or what?

BTW, it seems to me that this is a much more reasonable way to represent
infrequently used control characters than \nnn!

					Thanks,
					Roy Binz

					ucbvax!nbires!reb
					allegra!nbires!reb
					hao!nbires!reb