Hi, a mirror is not your solution this is something totally different.
I think what you are looking for is something like VNC it gives you the ability to control your screen from a different location...
Try tightvnc (www.tightvnc.com) it's free and easy to use.
You also find a lot video's of it on youtube installing, using, configuaring etc.
What is the best way to access a program (or game)from my desktop (the program is actually installed on a portable hd on this comp.) over a shared network on my laptop without having to install the program (or game) on the laptop...would itbe mirroring the hd? or installing portal software? or something else? Any tips on good software programs out there to accomplish this and any install tips is also appreciated..