Instantly switching between Windows and Linux

[Marcos Reyes]

I would like to know if it would be possible, now or in the future, to
instantly switch between two running operating systems on one machine.  For
example by dividing the RAM on the machine to be dedicated to each OS, and
having a buffer for device states.
It would be really cool, for example, to launch a shortcut from within
windows that launches a program in Linux.  Though some multitasking would be
lost, as processes in Windows would be suspended.  Or maybe not, with
multi-processor systems?  I don't know anything about this... just a dream.
Would be great to migrate people to Linux.         M