virtual devices in os
types of devices in operating system
The combination of dedicated devices and shared devices those devices are called as vertual devices.
Virtual Layer
Operating system
The device drivers allow the operating system to communicate with peripheral devices.
The best software for creating a virtual XP operating system is Virtual Box. Other software that are listed in the top five are Parallels, V Mware, QEMU and Windows Virtual PC.
A virtual machine will provide generic hardware that can be found in many other computers. Having a virtual machine eliminates the need to have either a second system, or to reboot to test their operating system.
Virtual operating system
Don't delete the virtual memory. It is essential to the running of your operating system.
Yes, but only one can be in control of the system. When a choice of operating systems exist, you typically choose the controlling operating system via a boot menu at startup. To switch to another operating system, you must restart the system. It is possible to run two or more operating systems at the same time via virtual machines. A virtual machine is a software program that emulates a real computer. However, operating systems within a virtual machine have no direct control over the physical machine which is always under the direct control of the one operating system chosen at startup. Virtual machine operating system calls are routed to the virtual machine software which must translate the call to invoke the appropriate system function of controlling operating system. As a result, virtual machines perform extremely poorly compared to the physical machines within which they operate.
Drivers are written for many operating systems.
An advantage of using a virtual machine is you can run multiple operating systems under the umbrella of one operating system. Without a virtual machine you have to reboot every time you want to want to change operating systems but with a VM you can simply switch between them.