I HAVE to make linux my main system. SOMEHOW. Xen is cool. It's premitive multitasking on an operating system! it's like how protected mode is newer and can start up an old MS-DOS program with v8086 mode and the programs can't tell and with Xen it just picks one of the OS's and forwards all of it's requests for hardware stuff into the real hardware, thus domain 0, and thus that OS does all the drivers for Xen to use, and it's the one that displays on the screen. Then the other OS's video cards are emulated by a software program in Xen that forwards it to the output functions in the kernel of the OS in domain 0. you could run linux as your main computer, and have a UML kernel run too to test stuff. I wonder how fast VMWare runs windows..? you need some windows programs. Milkdrop, powertoy calculator, word, autocad,