No it does not.
Yes, World of Warcraft can be bought and digitally downloaded from Blizzard, the company who makes it.
It is not possible to buy Bus Driver without it being downloaded onto the computer in which you bought it from.If you want to buy it on one computer and have it downloaded on a next computer, download it on the computer you bought it from then transfer it using a flashdrive :)
You cannot use Wacom Cintiq 13HD without a computer. This will have to be downloaded to a computer in order for this to be used.
You can't play dota without installing warcraft 3.
You can install World of Warcraft on as many computer as you want since there is no code required to install the game itself. However, you can only log on to an account from one computer at a time. If you want to run multiple computers at the same time, you will have to pay for another account.
No. You can run it over dialup, but I would rather not play than play WoW over dialup.You can however play Warcraft, Warcraft II and Warcraft III without internet.
You can't watch dota trailer without installing warcraft 3. But, you can watch it in the internet, specifically on youtube.
adware
Vanilla refers to the original World of Warcraft, without any expansions. It does NOT refer to Burning Crusade, Wrath of the Lich King, Cataclysm, or any of the Warcraft RTS games (Warcraft, 2,3).
You shouldn't need the key to use Add/Remove programs in the control panel.
No. I had Warcraft I, II and III on my laptop but not on my desktop, WoW loaded great without them.
You can't. World of Warcraft requires a monthly payment. There is no way around this.