Does A Bluetooth Headset Work With Msn How Do I Make Cell Phone Calls From My PC?

How do I make cell phone calls from my PC? - does a bluetooth headset work with msn

I work in a highly mobile and use a Tablet PC with wireless broadband and a Bluetooth headset for dictation and networking meetings and MSN and a cell phone for my regular calls. Could I connect to my phone to my PC, I can make and receive calls on my phone to my PC with a kind of interface. This would allow me to share a common interface for all my work have tools. Somebody has an idea to do this?