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How exactly does CloudStack stop a VM?

Hi, all:

We have a few VM instances which will hang when issue a Stop command from CloudStack web UI or thru API calls, due to the app’s own startup/stop script in guest OS was not properly invoked.  The app’s startup/stop script works properly if we issue shutdown/reboot command in guest OS directly.

Hence here is my question:  when CloudStack tries to stop a running VM instance, what is the exact command it sends to VM to stop it, with or without forced flag?  What are the interactions between the CloudStack, the hypervisor and the guest VM?