Abstract: Systems and techniques to generate a virtual hierarchy for navigating in and between object hierarchies. In general, in one implementation, the technique includes: flagging nodes in one or more object hierarchies as entry points and generating a virtual hierarchy including a virtual root and the nodes flagged as entry points depend directly from the virtual root.

Abstract: A method includes retrieving a page address from a repository based on a user role and an object link and linking to a page based on the page address. The method may include extracting an object ID from the link. The method may also include using a generator to determine the address based on a user role and the object ID. The method further includes recording the user role.

Abstract: A client computer and a server computer communicate via a network; the server computer receives user identification via the client computer that is selectively a first device or a second device. The server computer stores at least first and second application services for a single predetermined application class, wherein the first and second application services are adapted to client computer type. Upon receiving user identification, the server computer further receives a device attribute from the client computer, compares the device attribute with reference attributes, and selectively sends a representation of the first application service or of the second application service to the client computer according to the device attribute.