Virtual Machine

Hello,
Hi,

what is the difference between virtual machine and physical machine?

(AND)

how can i identify whether my application is running in a Virtual Machine or not?

(AND)

how can i get all the VMs from a physical host ?

(AND)

how can i differentiate physical OS and Virtual Machine OS


(AND)can identify current machine is a Virtual machine ?


because i created license based on IP ADDRESS

But now using Virtual machine server users creating the VM image ie the copy of whole Product and using it

in this condition both of them having same ip address and using the same License .

i cant differentiate IP address


So i need to identify another condition and based on that i have to create license.


Please give me some idea


Thanks in advance

Portia