|PPNCG Information Pages : Video-conferencing : Data Sharing (Application window sharing etc.)|
|Data sharing is a videoconferencing feature which offers extremely useful
facilities for our community, but has, to date, apparently received little
usage, partly (it seems) due to confusion between the several different
offerings for implementing it, and the inconvenience and unfamiliarity of
setting it up. Nevertheless, when users see it in action they often
recognise it as something that would improve their videoconferencing
efficacy, and so it seems worth continuing to promote the idea.
With this kind of facility in action, you are not limited to a few specific applications (chat, whiteboard, powerpoint etc.), but you can share just any application windows on your display - even the entire desktop if you wish. In appropriate situations, you can grant control of the applications to other conference participants.
Remember that although the videoconferencing platform is typically Windows, it's still possible from the same PC to get X windows from a remote Unix-style system by means of an X server like eXceed or Cygwin/X, and then to include those windows in the conference application sharing. Thus you could include (say) not only your PowerPoint presentation window, but also the real live window of your Unix-based Physics application on screen, while still speaking to camera. This is _so_ much better than trying to point the camera at a projector screen, and have the distant viewers peering at a poorly focussed and low-contrast video image of a projection of your presentation (and losing sight of all your eloquent gestures)!
(Of course, if you have more than one PC then you might use one for
the audio/video conferencing and another for the shared application
windows; but here I'm concentrating on techniques/tricks for working
out of a single PC.)
|* Technologies in active use for data sharing
1) T.120 using the data sharing component of Netmeeting
T.120 is the data sharing specification that's included in the H.323 IP videoconferencing framework. The data sharing component of Netmeeting is the usual way of sharing ("MS-Windows") application windows in this context. Much of the remaining sections of this page deal with that approach, but there are others.
2) The data sharing feature of the "Latitude" MeetingPlace server.
vnc is a cross-platform application sharing framework which has no
specific relationship with videoconferencing: it has been used and
proven in practice in many different situations, having nothing
to do with T.120 nor even with H.323.
Its particular relevance to our situation is that it was selected
by the VRVS as the supported method of sharing application windows
in their videoconferencing system, http://vrvs.org
|We now move to give some detail on the three above methods of
2003-Dec-11 19:39 email@example.com
One should be aware that Netmeeting data sharing, like any other means of exchanging files, represents a possible route of infection for viruses, trojans etc.
Also, configuring Netmeeting to automatically accept incoming calls could leave one open to intruders.
The usual kinds of precautions should be taken against these potential
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