Firstly, if you do not already have Parallels for Mac OS X, you can get it by going to http://www.parallels.com/uk/download/desktop/ and clicking either Download or Try Now. If you click Try Now, you can try Parallels for a short time before buying it. If you have downloaded Parallels, browse to the folder where it has been downloaded and double-click it. Follow the instructions to install it. If you have a CD with Parallels on it, insert it into your Mac's DVD drive and follow the instructions from there.
Once you have installed Parallels Desktop, you will need to install an operating system of choice. Please note you will need a CD and a valid license for the operating system you are choosing to install as this does not come with Parallels. Once you have this, follow the instructions on-screen to install the operating system, and when this is done you can run it from within a window on your Mac OS X Desktop
Parallels features true copy & paste and drag & drop - move files, folders and data seamlessly back and forth between Windows and Mac OS X.
Yes. Just make sure its connected when you're using parallels. when you install an OS with parallels edit its installation location to the location in the external hard disc.
virtualbox (free) vmware (paid)
Boot Camp is a Mac OS X utility that takes you through the installation process. You can install Windows manually, or with software such as Parallels, Fusion or Virtual Box. (See links below)
dock and toolbar
No, use BootCamp or Parallels
You can install the Mac version of LimeWire on Mac OS X. (See links below)
Yes, you need to install Windows 7 onto Bootcamp (which comes free with the mac) or parallels, which you can buy. Then you can boot into Windows 7 or Mac OS X.
AutoDesk's Revit is currently only available for the Windows operating system so the Mac will need to be running Windows to use the software. AutoDesk have produced a guide for using Revit on a Mac (See links below).
The Mac OS X Tiger install DVD is the DVD that allows you to install 10.4 software onto your Mac. 10.4 is Tiger, and so it is called Mac OS X Tiger.
Apple's Mac computers can run Mac OS X and Windows (and Linux if required) but the licensing agreement for Mac OS X prevents it being legally installed on computers that are not made by Apple.
Mac OS X install media is a repair disk that allows you to re-install the operating system on your Mac in case of hardware failure or repair. You don't have to have a physical install disc, because OS X is built in your Mac.