How to call a service from the air app when user unistalls the app?

Hi All,

I have an air application which has a registration mechanism. i.e the app gets registered through a license key purchased from the admin.

During registration user's system ip address gets subscribed to the license key.

I have a requirement that when the application gets uninstalled, a service must be called to free the license key from that ip address. So that the same user can use the license key

in another system.

So how to call a service when the air application gets uninstalled from the system. or how to handle the uninstall event? Is there any mechanism or solution?

Please help.

Thanks in advance.

Regards,

Jameel