: Emulation is significantly slower than native booting or dedicated virtual machines like VirtualBox Fixed Window : The emulator frame is generally not resizable. Mouse Capture

: Testing a bootable drive in a virtual environment prevents accidental changes to your actual computer's operating system. How to Use It

: Boots your USB drive or ISO file in a virtual window so you can verify the boot menu and system loading.

Test your bootable USB sticks while your Windows session is still running.

If you are researching the underlying technology behind such tools, you may want to look into papers or documentation for: QEMU (Quick Emulator)