How to share Single Mac OS X Application for remote desktop
For this you need to use "Screen Sharing".



Open "System Preferences" and select "Sharing". Now click the lock at bottom left to allow changes. You will be asked for your password.

Now click on "Screen Sharing". On the right you can now click on "Computer Settings..." Select "VNC Viewers may control screen with password and enter a password in the box. Click on "OK" and quit from "System Preferences".

You will now be able to use a VNC client on  your PC to control the Mac. This will not allow two people to use the computer at the same time.