A method and data structures for use in providing diagnostics on-demand services are provided. A data structure is provided that identifies one or more server-side entry points for use by a client computer upon which diagnostics on-demand are to be performed. A data structure is also provided that identifies available diagnostics modules, their component files, and that provides installation instructions for use in retrieving and installing diagnostics modules. A method for providing diagnostics on-demand utilizing the data files is also provided.