If you want to verify your custom plug-ins, you can deploy the plug-ins first on your local vSphere Client and vSphere Web Client. You must register your local instances of the Web browser applications with the vCenter Server Appliance or vCenter Server for Windows to be able to deploy your plug-ins locally.
The SDK provides a registration script that you can run in the vCenter Server instance. The files generated by this script connect your local Web browser application to the remote vCenter Server system.