The document discusses role-based and application specific clients for product lifecycle management (PLM) systems. It defines these clients as user interfaces that are tailored to specific tasks by removing unnecessary functions, consolidating relevant information, and localizing for the user's environment. The goals are to increase adoption rates by making the system easier for casual users and to engage stubborn users by adapting to their needs. While standardized clients reduce costs, role-based clients can boost efficiency. Examples provided include barcode and touchscreen interfaces. The document recommends driving client design from the data model and using web services for security. It provides examples of simple portal clients built in HTML and ASPX with code samples for authentication against the PLM system.