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Built users and their rights The power and flexibility of Windows NT security depends on the presence of a wide range of user groups for the implementation of the system. To illustrate this assertion in the following two tables lists change and embedded rights groups built for Windows NT. The first table shows the change of embedded groups. The following table presents the built-rights groups built. When a new group administrator can give them any changes right, but built to dispose of it may not - they are essential attributes of built and built only groups. Conclusions The main purpose I / O subsystem are: organization of parallel processor and I / O devices with an acceptable level of response for each driver, and minimize the total CPU usage; Harmonization speed of the processor, memory and I / O devices; I / O devices division between processes; About ensure convenient logical interface to I / O devices. Q I / O subsystem is usually clear multilayer structure, which helps to bring a large number of multiple drivers in the general interface. Drivers are divided into low-level, direct control of external controller devices, and high level to ensure logical interface to devices, such as drivers file systems. To coordinate drivers in the I / O subsystem can be allocated to a particular module, called the I / O manager. Hardware drivers are divided into blocks targeted to provide access to devices with poblochnoy immediate addressing, and Bayt targeted managing devices that support pobaytny not adresuemy exchange. The file is named area of external memory, which can record and from which you can read the data. The main objectives of the files are: long-term and safe storage of information, as well as share data. File System is a set of system software which implements various operations with files, such as the creation, destruction, read, write, and search for naming files. A file system is also aware of the set of all files and office structures data stored on the external device. In addition to normal operating system files, usually supported file types such as directories, symbolic links, named conveyors and special files. Special file is a universal model of I / O devices, introducing it for the rest of the operating system and application processes in the form of unstructured set of bytes that is a normal file. Modern file systems have a hierarchical structure, naming files and helps them search. Physical organizations file system means and ways of addressing some of the files in sections and sectors of disk memory, and how performance information on the description of the files and their attributes. To synchronize processes working together, trying to use the same file simultaneously, in the file system is locking mechanism files and individual records in files. A mechanism to control access to files multi-OS enables administrators to ask for individual users and user groups set of operations that are allowed to perform over a file or a group of files together into a directory. Access to the OS is based on one of two basic approaches: selective access when the owner of the file itself can determine access rights to mandate access and file, which defines the right of membership in a particular user group, and you may not be able to arbitrarily change or delegate. The rights of access to the file may be attributed clearly, and may inherit from a parent directory, which reduces the number of manual operations and facilitates access logic.
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