Because not all operating system are perfectly suited to all tasks. You wouldn't haul grain in a Cadillac, and you wouldn't want to ride in the back of a Peterbilt after your wedding. The same goes for operating systems. While some are extremely versatile, they may not be able to fill that tiniest little niche that almost no one thinks of, so an operating system needs to be written for that task.
Any computer with the ability to understand "partitions" can run multiple operating systems, albeit one at a time. Any computer with the ability to run virtual hardware (such as with a Hypervisor) can run more than one operating system simultaneously. The operating system must also support partitions or it will be unable to run on a hard drive with more than one partition.
Yes. This is known as "dual-booting."
Multiusers is when more than one user can do something at one time
Multitasking.
Any Linux-based operating system that is capable of multitasking. (I.E. doing more than one thing at the same time.)
Yes.
Any computer with the ability to understand "partitions" can run multiple operating systems, albeit one at a time. Any computer with the ability to run virtual hardware (such as with a Hypervisor) can run more than one operating system simultaneously. The operating system must also support partitions or it will be unable to run on a hard drive with more than one partition.
HTC mobile phones use more than one operating system. One of the operating systems it uses is the Android based operating system. It also uses the Windows operating system.
Yes. This is known as "dual-booting."
Multiusers is when more than one user can do something at one time
it allow more than one program to run at one time
It is a software which allows more than one program to run at one time
That would obviously depend on what operating systems you are using.
Dual-booting is the process of running more than one operating system on a computer.
to support more than one user at the same time.BOOBS(.)(.)HA HA
Multitasking.
More than one user can use the mainframe at once.