Nice free full virtualization system. I am keeping entry of few command line tools for easy referance.

| stop

vmrun -h https://localhost:8333/sdk -u root -p <password> stop "[standard] Windows 7/Windows 7.vmx"

| start

vmrun -h https://localhost:8333/sdk -u root -p <password> start "[standard] Windows 7/Windows 7.vmx"