After it has configured its network, the appliance starts the VM Agent (a binary executable provided by APK), which opens a service connection to the CA AppLogic® infrastructure, using a CA Technologies proprietary binary protocol.
When the boot is completed, the appliance uses the service connection to report success or failure. APK provides the necessary tools to the appliance designer to add customized code to check if the appliance started OK and report status to the grid. If failure is reported, or if the appliance fails to contact the grid altogether, the appliance start is considered un-successful and the virtual machine (and possibly the entire application in which this appliance participates) is shut down.
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