Dual-booting is the process of running more than one operating system on a computer.
Yes. This is called "dual-booting."
Dual booting is not restricted to Linux. Dual booting refers to the presence of two operating systems on one computer. Switch/choice between these operating systems is determined at boot time (either via bios or boot manager), therefore only one operating system is at use at a time.
Yes. This is known as "dual-booting."
Dual booting means two operating system installed on PC. for example you install windows xp and windows vista at the same time. or windows xp and Linux on same PC. Dual booting is only a term you can install more than one operating system on one PC. for example you can install 10 windows xp copies on your 10 drives.
virtualization has its own benefits over dual booting. it allows you to use two or more OS at the same time on the same computer. However in dual boot it is not possible to run two OSs simultaneously.
Dual booting for 2 operating systems or Multi booting for 2 and above.
If one or of the operating systems does not cooperate well with dual-booting (such as Windows with a Linux distribution), then you should install the troublesome operating system first. If both are well-behaved (such as two Linux distributions) then it does not generally matter.
No they are not illegal.
installing and testing new device drivers
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By dual-booting. You install them both to the same computer and choose between them at boot.