Added PHOTO.

doc/info/photo.6

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+-*-Text-*-
+
+File: PHOTO	Node: Top	Up: (DIR)
+
+PHOTO is a simple program for capturing the output of a terminal
+session.  Doing
+
+    :PHOTO DSK:FRED;PHOTO OUTPUT
+
+will open a STY and start a new job-tree who's TTY output is being
+saved in the named file.  A consequence of starting up a new tree like
+this is that the first thing you will have to do is to log in.  (It is
+as if you were using supdup or telnet to hop right back to your own
+machine.)
+
+The characteristics of the terminal seen by the created job-tree will
+be those of a printing terminal.  Since you are making a file
+containing all of the output sent to that terminal, it is generally
+not useful or desirable to try and change this.  (Thus if your login
+init offers to set your terminal type to something else, you should
+decline.)
+
+By default PHOTO names its output file .PHOTO > in your working
+directory.
+
+The PHOTO escape character is Control-^ on terminals without a real Break
+key (most terminals), or Break on terminals with a Break key (Knight TVs,
+Lisp Machines, etc.).  (Note that on a Lisp Machine the Break key is
+labeled "Suspend".)  The things you can type after the escape character
+are:
+
+^Z - do a local control-Z - return to DDT.
+^_ - do a local control-_ - begin terminal escape command.
+F  - stop or resume sending output to photo file.
+P  - return to DDT, :PROCEED the PHOTO (run it without the TTY).
+Q  - closes the STY and kills the PHOTO, detaching any foreign job-tree.
+L  - closes the STY and kills the PHOTO, logging out any foreign job-tree.
+?  - types this help message.
+C  - changes the PHOTO escape character.  Follow by new escape char.
+<PHOTO Escape Character>  - sends the character through.