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.several physical hard disks.volatile key In Microsoft Windows, aSee also volume.Registry key whose contents are construct-ed at the time the system boots, rather thanVPC See Virtual Path Connection.being permanently stored in a hive file.VPI See Virtual Path Identifier.See also hive; key; Registry; sub-hive; sub-key; value entry.VP/ix An MS-DOS emulation packagefrom Sun Microsystems that allows you tovolume In the Novell networking world,access programs and data files under the MS-a volume is the highest level of the file serverDOS partition and use them in the Unix en-directory and file structure.vironment as a task under Unix.To the user,the sessions look exactly as they would if youLarge hard disks can be divided into severalvolumes when the network operating sys- changed partitions and booted MS-DOS.tem is first installed, and with volume span-VPN See Virtual Private Network.ning, volumes can include multiple physicaldrives.VRAM See video RAM.volume label In many operating sys-VRML See Virtual Reality Modelingtems, the name assigned to a disk by the us-Language.er, displayed on the first line of a directorylisting.The Macintosh, on which disks are VSAT See very small aperture terminal.411Copyright © 2000 SYBEX Inc., Alameda, CA.www.sybex.com2461book Page 412 Thursday, May 4, 2000 11:59 AMVT-52, VT-100, VT-200VT-52, VT-100, VT-200 A series of asyn- terminal-emulation packages include emu-chronous terminals manufactured by Digi- lations of these terminals.tal Equipment Corporation (DEC) that usesVTAM See Virtual Telecommunicationsa specific set of control codes for displayAccess Method.management.Many communications and412Copyright © 2000 SYBEX Inc., Alameda, CA.www.sybex.com2461book Page 413 Thursday, May 4, 2000 11:59 AMweak passwordWW3 See World Wide Web.WDMA divides each channel into a set oftime slots using time-division multiplexing,W3C See World Wide Web Consortium.and data from different sources is assignedto a repeating set of time slots.WABI See Windows Application BinaryInterface.See also time-division multiplexing; wave-length division multiplexing.WAIS See Wide Area InformationService.wavelength division multiplexingwait state A clock cycle during which noAbbreviated WDM.A frequency-divisioninstructions are executed, because the pro-multiplexing (FDM) technique that allowscessor is waiting for data from memory.a single fiber-optic cable to carry multipleStatic RAM chips and paged-mode RAMlight signals rather than a single light signal.chips are becoming popular because theyWDM places each signal on a differentcan store information without being con-frequency.stantly refreshed by the processor, thusSee also frequency-division multiplexing;eliminating the wait state.A computer thatinverse multiplexing; time-division multi-can process information without wait statesplexing; statistical multiplexing.is known as a zero-wait-state computer.WAN See wide-area network.WBEM See Web-Based EnterpriseManagement.warm boot A reboot performed afterthe operating system has been running forWDM See wavelength divisionsome period of time, by pressing Ctrl+multiplexing.Alt+Del rather than cycling the power tothe computer.WDMA See wavelength division multi-ple access.Warp See OS/2.WATS See Wide Area Telephoneweak password A password that isService.easy to guess, such as an English word, anyreference to Star Trek or Star Wars, or awavelength division multiple accessword or number that relates to the user,Abbreviated WDMA.A technique thatsuch as the name of a family member or amanages multiple transmissions on a fiber-birth date.optic cable system using wavelength divi-sion multiplexing (WDM).See also password; strong password.413Copyright © 2000 SYBEX Inc., Alameda, CA.www.sybex.com2461book Page 414 Thursday, May 4, 2000 11:59 AMWebWeb See World Wide Web.Netscape Navigator and Microsoft InternetExplorer are examples of popular WebWeb-Based Enterprise Managementbrowsers.Abbreviated WBEM.A platform-indepen-See also ActiveX; helper; HyperText Mark-dent management standard, originally pro-up Language; player; plug-in; Uniform Re-posed by BMC Software, Cisco Systems,source Locator; viewer; World Wide Web.Compaq, Intel, and Microsoft and nowsupported by more than 70 companies, toWebmaster The person responsible forallow network, systems, and applicationsmaintaining and administering a Web site.software data from a variety of sources tobe accessed and reported by managementWebNFS A technology from Sun Micro-applications regardless of the originalsystems that extends the Network File Sys-source of that data.tem (NFS) to the Internet.See also Desktop Management Interface;WebNFS makes file access across the Inter-Simple Network Management Protocol;net as easy as local file access, provides en-total cost of ownership; Wired forhanced download performance, and canManagement.automatically resume a file transfer after abroken connection is restored.Web browser A client application thatlets you look at hypertext documents, fol- Web page Information placed on a Webserver for viewing with a Web browser.Alow links to other HTML documents, anddownload files on the Internet or on a cor- Web page can contain text, graphics, audioor video clips, and links to other Web pages.porate intranet.See also Web browser.When you find something that interests youas you browse through a hypertext docu-Web portal See portal.ment, you can click on that object, and thesystem automatically takes care of access-Web server A hardware and softwareing the Internet host that holds the docu-package that provides services to clientment you requested; you don t need tocomputers running Web browsers [ Pobierz caÅ‚ość w formacie PDF ]