Hidden Television / Two way mirror

I am assuming that what I see on the DIY channel lately to make a "hidden television" in a mirror is just a two way mirror. Is that right. I am planning to make the screen into the master dresser mirror. Can anyone tell me.:
1. If indeed a two way mirror is what they use for this?
2. How it effects the actual viewing, both plasma and led considered?
3. Shortcommings - heat issues, etc.. Does it work better in Dark room ( I do suspect)?
4. Specifics to install. Does there need to be small space, flush, etc?
5. What about going to the trouble to disassemble the TV (Plasma example). My LG 60" plasma states "Protective Skin Glass". Can I remove that and replace with two way mirror? Would this make the best picture with this application?

I was watching a DIY BathCrashers I think and they stated that the hidden Television mirror did not come in time, and that they used some sort of relfective film or "tint" on top of glass to simulate the product. But I gathered that what they used was pennies compared to the hidden television mirrors costing thousands. Does anyone know exactly what reflective film they may have been using. I am guessing it was just a mirrored window tint? I did note they played down the presentation of the TV at the end of the show, as it was noticeably not as good. But it seemed decent so I might like to try...