Yes
Yes. With LogMeIn installed on a PC you can access the PC from a web browser on a Mac.
You need a server software - Windows server, Mac Server or A Linux serverStart there
PC means personal computer and mac means Mandatory Access Control
If it's just one PC, you could block the MAC address from outside traffic on the router. You could also remove the gateway IP address on the PC. You could set a bogus Proxy server in Internet Explorer (that just blocks IE though)
Sadly, it is no possible. PC games are made only for PC. You must buy the Mac version of your game to play it on the mac.
If the mac graphic card match the Dell pc slot for graphic cards, it is quite possible.
Yes, with the new Steamplay Feature, it is possible. It even made it possible to Play against people on the PS3.(look at portal 2) all games Labeled with: SteamPlay(tm) PC+MAC are playable on the Mac and can you can play against PC's
The MAC address is the LAN/Ethernet card address there is no specfic Mac address for active directoy. Each server/PC in the world has its own unique mac address.
It is possible to buy a cheap server from PCWorld. That is because a server can be a high specification PC and also because PCWorld do have a a section dedicated to selling to businesses.
Unfortunately there is not an option to do this on Windows. You can do it on a Mac or use an iDevice.
When referring to a mainframe computer it is the reply (or response) output to the input device. On a Networked PC it refers to the reply received from the PC acting as server (data repository) which may or may not also control domain access. When using a PC to access the internet it refers to the reply from the ISP servers.
That's not possible