We hope this information helps you to make your decision.
Is the Slingbox Pro HD a device that I can connect to my Direct tv..separate from someone watching tv in home (where the slingbox pro hd/direct tv will be located0?
Yes, keep in mind that the Slingbox PRO HD has an internal tuner that will allow you to watch a different TV signal without affecting to home viewers.
Second, if this can be done remotely, is it true that I can get dvi to video and audio to audio on televison on remote area and watch from that television, using my MacBook Pro as a 'conduit' for capturing via slingbox online?
Yes, in that case, you can look for the SlingCatcher.
Third, I have seen many entries about difficulties with Mac's..does anyone have any feedback on the best way to connect or advise.
It all depends on your Mac computer. This link will provide you with the system requirements for the Slingbox PRO HD on Mac computers.
Let's say I am living in Dallas, get the slingbox pro hd all set up with direct tv, etc..and when I get temporarily relocated to Washington D.C...I can actually watch direct tv from my home in Dallas, via the internet on my laptop in Washington D.C?
Yes. You only need to enable the Internet Viewing feature on your Slingbox.