This is a version of PHOTO modified to work with the new version
of the PY/TW drivers.  It has been tested under both VMS V5.0 and
VMS V4.7.   This could use some work to clean it up and use the
new features of the drivers.

Note that PHY_IO privilege is required to properly propagate the
terminal characteristics, and PHOTO should therefore be installed
with PHY_IO.  If PHOTO is not installed and the user does not have
PHY_IO, a warning message will be issued and the pseudo-terminal
will not have the same characteristics as the user's real terminal.
PHOTO will still produce a session log, however.

	/Kevin Carosso                     kvc@nrc.com
	 Network Research Co.              kvc@ymir.bitnet

	June 9, 1988

---------------------------------------------------------------------------

     PHOTO running on a multi-processor VAX (e.g.  VAX 8800) with
VAX/VMS Version 5.x runs into a problem due to SMP which allows the
subprocess to get MUCH more CPU time then was previously possible
without SMP.  The subprocess generates hangups very rapidly and on a
lightly loaded system it will generate a hangup between the time
"enable_hangups" is turned on and when begin_session posts a
QIOW(IO$_READVBLK) on py_chan.  This causes PHOTO to exit as if the
subprocess had logged out!

     PHOTO has been fixed to issue a QIO instead of QIOW followed by
WAITFR and "enable_hangups" is now turned on after the first QIO to
py_chan in begin_session (used to be turned on in main).  It has been
tested on a VAX 8800 with VAX/VMS Version 5.0-2.

	Michael Kimura		Internet: mnk%draco@hac2arpa.hac.com
	Hughes Aircraft Co.	BITnet:   mnk@draco.hac.com

	January 31, 1989