Vimarun for Windows is an application to automatically run virtual machines in VMware Workstation and VMware Player.
When you start your computer, the selected virtual machines will start with your host. The virtual machines are running even before you login.
When the computer is shut down then the virtual machine is automatically suspended. This is also the case when Windows update restarts the computer for you. The virtual machine is suspended and started along, as if the computer was never shut down.