[CentOS] virtualization on the desktop a myth, or a reality?

[Kevin K]

On Mar 3, 2011, at 6:38 AM, Always Learning wrote:

> 
> On Wed, 2011-03-02 at 19:18 -0800, Dr. Ed Morbius wrote:
> 
>> It far and away already has.  Dual-booting is a bastard compromise which
>> forces you to select between altnernative OSs, doesn't allow for
>> simultaneous access to features (and storage) of both, and generally
>> necessitates use of some low-standard transfer storage partition (e.g.:
>> vfat).
> 
> My dual-booting, actually tri-booting, with Vista (ugh!), Centos
> (brilliant) and Fedora 14 (not keen and a bit seriously buggy) allows me
> in Linux to access and change the file space content used by the other
> two operating systems.  Surely that constitutes simultaneous access to
> storage? 
> 

If you are tri-booting, how are you accessing the file systems of the other OS's "at the same time"?  Don't you have to reboot to change OS's?