If that Mac has DisplayPort for video out, then yes it does.
Both DisplayPort and HDMI cables carry video and sound, so yes.
No DisplayPort is a digital display interface standard put forth by the Video Electronics Standards Association
Yes if the PC has DisplayPort out and the projector VGA in.
The Mac Pro graphics card has two Mini DisplayPort outputs which will connect to a LED Cinema Display with a Mini DisplayPort connector cable that comes with the Cinema Display.
If the HP has a full size DisplayPort out and the projector is VGA in. Yes
Within reason yes. If the monitor has the right connectors that fit the Mac then it's basically a Plug-n-Play. You can't really expect to use a 50 inch monitor on a bottom of the line Mac Mini and expect to use it at the fullest resolution.
The PTC Premium DisplayPort Male to HDMI Female Adapter provide exceptional picture quality.
Mini DisplayPort was created in 2008.
Yes you can there are programs to help you.
DisplayPort is a new video format that is royalty free so it may become more common.It's quality is similar to HDMI.
Neither. They use a video port, VGA, DVI, HDMI or Displayport.
No. Only Displayport and HDMI cables carry audio along with video.