A virtual LAN system forms a virtual group which is based on elements having physical attribute or logical attribute and constituting a virtual LAN, sets a client address and priority of the virtual group in a virtual group registration table, and allocates unicast and broadcast traffic bands in group units.

Virtual LAN system

A data processing method and system for providing an installable file system using a basic file system driver and for flexibility in the views of objects through an operating system. An embodiment of the present invention includes a virtual file system which includes virtual files and folders correlated to native folders. Requests to open specified virtual files invoke the native file system driver to open the native files referenced by the virtual file for the specified virtual files. In addition, a view application is provided for configurable views of the files in the file system wherein the custom views include custom attributes relating to the file.

Installable file system having virtual file system drive, virtual device driver, and virtual disks

Executing programs coded in an instruction set of a first computer on a computer of a second, different architecture. An operating system maintains an association between each one of a set of concurrent threads and a set of computer resources of the thread's context. Without modifying a pre-existing operating system of the computer, an entry exception is establishing to be raised on each entry to the operating system at a specified entry point or on a specified condition. The entry exception has an associated entry handler programmed to save a context of an interrupted thread and modify the thread context before delivering the modified context to the operating system. A resumption exception is established to be raised on each resumption from the operating system complementary to one of the specified entries. The resumption exception has an associated exit handler programmed to restore the context saved by a corresponding execution of the entry handler. The entry exception, exit exception, entry handler, and exit handler are cooperatively designed to maintain an association between a one of the threads and an extended context of the thread through a context change induced by the operating system, the extended context including resources of the computer associated with the thread beyond those resources whose association with the thread is maintained by the operating system.

Apparatus for executing programs for a first computer architechture on a computer of a second architechture

A method and apparatus are provided for supplying a reliable and maintainable operating system in a net-booted environment. According to one embodiment, a network computer (NC) client boots from a boot image provided by an NC server. The boot image includes information identifying the location of one or more system volumes on the NC server that contain operating system software. In response to an attempt to modify the contents of the one or more system volumes, the NC client causes information identifying the modification to be recorded on the NC server separate from the one or more system volumes in a storage area associated with the NC client.

Providing a reliable operating system for clients of a net-booted environment

A method and apparatus for accessing storage from at least two different host computers features creating a first file having a first meta-data format and user data blocks in a mass storage medium using the first host computer and reading a logical to physical mapping of the user data blocks from the first file. A second file, having a second meta-data format, is created using a second host computer and the second file has blocks preallocated to be the same length as user data blocks of the first file. A logical to physical mapping of the preallocated user blocks is then obtained and the data blocks of the preallocated file are linked to the data blocks of the first file so that a reference to the preallocated blocks will provide an address at which the data requested can be read in the first file. In this manner, different meta-data blocks, corresponding to different filesystems, and/or operating systems, can be used in the respective first and second host computers.

Method and apparatus providing mass storage access from systems using different meta-data formats

A hybrid system environment includes a proprietary operating system and processing unit and a non-proprietary operating system (UNIX based) and processing unit. The systems tightly couple to a system bus in common with a main memory and a number of multiline communications controllers and communicate through a common area of main memory. The UNIX terminal connections to such controllers are virtual connections applied by a virtual terminal driver through the system proprietary communications software components. These components include a server, a network terminal driver (NTD) and a number of multiplexer driver modules. A multiplexer physical terminal driver is included in the UNIX-based operating system and a switching mechanism is incorporated into the virtual terminal driver for enabling switching to such physical terminal driver when a user switches via a switch command to the UNIX-based operating system. The server module upon being invoked upon such switching operates to establish a direct communications path between an application running under the UNIX-based operating system and the controller communications line paths through the multiplexer driver module and logically disconnects the virtual communications line path from the NTD module to the multiplexer driver module thereby improving system efficiency and terminal connectivity.

System for switching between two different operating systems by invoking the server to determine physical conditions to initiate a physical connection transparent to the user

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System for switching between two different operating systems by invoking the server to determine physical conditions to initiate a physical connection transparent to the user