vSphere Client SDK Setup To develop HTML plug-ins for the vSphere Client, you must first set up your development environment. Software RequirementsYou can set up your development environment for developing HTML-based plug-ins by using specific software components. Development Environment Requirements OverviewBefore you start setting up your development environment, you must download the vSphere Client SDK to your working machine and have access to a vCenter Server for Windows or a vCenter Server Appliance instance. Setting Up for HTML-Based Plug-In DevelopmentThe vSphere Client SDK contains libraries, sample plug-ins, and various SDK tools that help you develop and build plug-ins for the vSphere Client.