Mac Dual monitors share w/ PC

I have a MacBook Pro and a desktop PC w/ a Viewsonic Flat monitor VGA plug.

I want to use the Viewsonic as a dual (secondary) monitor for my MBP, but also have a switch to use the Viewsonic as my primary monitor on the PC.

I've read about KVM switch, but not sure about the dual monitor aspect in the equation.

I may want to share PC keyboard/mouse for use on the MBP, but its not necessary.

Any ideas?? THANKS

This should help :
Guide to Sharing Keyboards and Monitors

google is your friend !

Hope it helps
Clay