Importance

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Abstract

A file system for use in a network computer system has a server file system in the server, which contains at least some file elements to be selectively accessed by the client. An overlay file system is assigned to the client within the server, and contains at least some file elements that have corresponding file elements in the server file system. The overlay file system is configured to provide an overlay file system element to the client when the file element exists in the overlay file system, and to allow access to a server file element when a corresponding file elements does not exist in the overlay file system. Through the use of such file system, a network file system can be configured to allow the client to write to it, with the appearance to the client that it is writing directly to the server file system. The overlay file system permits the installation or updating of software applications to client computers in very little time compared to previous techniques, and enabling the client computers to change or customize their operating environments, particularly those using shared file elements, without the involvement of system operators and without affecting the operations of other client computers.

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First Claim