C, UNIX
Linux
A very popular version of the Unix operating system that runs on a variety of hardware platforms including x86, Itanium, PowerPC and IBM's entire product line. Linux is widely used as a server OS and is gaining ground in the desktop market.
A very popular version of the Unix operating system that runs on a variety of hardware platforms including x86, Itanium, PowerPC and IBM's entire product line. Linux is widely used as a server OS and is gaining ground in the desktop market.
Windows NT
(Windows New Technology) A 32-bit operating system from Microsoft for Intel x86 CPUs. NT is the core technology in Windows 2000 and Windows XP (see Windows). Available in separate client and server versions, it includes built-in networking and preemptive multitasking. Windows NT was introduced in 1993 as Version 3.1 with the same user interface as Windows 3.1. In 1996, Version 4.0 switched to the Windows 95 desktop and changed some of the dialogs (see table below).
(Windows New Technology) A 32-bit operating system from Microsoft for Intel x86 CPUs. NT is the core technology in Windows 2000 and Windows XP (see Windows). Available in separate client and server versions, it includes built-in networking and preemptive multitasking. Windows NT was introduced in 1993 as Version 3.1 with the same user interface as Windows 3.1. In 1996, Version 4.0 switched to the Windows 95 desktop and changed some of the dialogs (see table below).
VMS
(Virtual Memory System) A multiuser, multitasking, virtual memory operating system for the VAX series from Digital. VMS applications run on any VAX from the MicroVAX to the largest unit.
(Virtual Memory System) A multiuser, multitasking, virtual memory operating system for the VAX series from Digital. VMS applications run on any VAX from the MicroVAX to the largest unit.
kernel
The fundamental part of a program, typically an operating system, that resides in memory at all times and provides the basic services. It is the part of the operating system that is closest to the machine and may activate the hardware directly or interface to another software layer that drives the hardware
The fundamental part of a program, typically an operating system, that resides in memory at all times and provides the basic services. It is the part of the operating system that is closest to the machine and may activate the hardware directly or interface to another software layer that drives the hardware
Tcl/Tk
(Tool Command Language/ToolKit) Pronounced "tickle" or "ticklet," it is an interpreted script language that is used to develop a variety of applications, including GUIs, prototypes and CGI scripts. Created for the Unix platform by John Ousterhout along with students at the University of California at Berkeley, it was later ported to PCs and Macs. Safe-Tcl is an enhanced Tcl interpreter that provides a secure, virus free environment.
Tcl also provides an interface into compiled applications (C, C++, etc.). The application is compiled with Tcl functions, which provide a bi-directional path between Tcl scripts and the executable programs. Tcl provides a way to "glue" program modules together. The Tk part of Tcl/Tk is the GUI toolkit, which is used to create graphical user interfaces. Other languages, including Perl, Python and Scheme, have incorporated Tk as well.
(Tool Command Language/ToolKit) Pronounced "tickle" or "ticklet," it is an interpreted script language that is used to develop a variety of applications, including GUIs, prototypes and CGI scripts. Created for the Unix platform by John Ousterhout along with students at the University of California at Berkeley, it was later ported to PCs and Macs. Safe-Tcl is an enhanced Tcl interpreter that provides a secure, virus free environment.
Tcl also provides an interface into compiled applications (C, C++, etc.). The application is compiled with Tcl functions, which provide a bi-directional path between Tcl scripts and the executable programs. Tcl provides a way to "glue" program modules together. The Tk part of Tcl/Tk is the GUI toolkit, which is used to create graphical user interfaces. Other languages, including Perl, Python and Scheme, have incorporated Tk as well.
multithreading
Multitasking within a single program. It allows multiple streams of execution to take place concurrently within the same program, each stream processing a different transaction or message. In order for a multithreaded program to achieve true performance gains, it must be run in a multitasking or multiprocessing environment, which allows multiple operations to take place.
Multitasking within a single program. It allows multiple streams of execution to take place concurrently within the same program, each stream processing a different transaction or message. In order for a multithreaded program to achieve true performance gains, it must be run in a multitasking or multiprocessing environment, which allows multiple operations to take place.
storage device
A peripheral unit that holds data such as disk, tape or flash memory card. For a summary of all storage technologies,
A peripheral unit that holds data such as disk, tape or flash memory card. For a summary of all storage technologies,
iSCSI
(Internet SCSI) A protocol that serializes SCSI commands and converts them to TCP/IP
(Internet SCSI) A protocol that serializes SCSI commands and converts them to TCP/IP
SAN
(Storage Area Network) A network of storage disks. In large enterprises, a SAN connects multiple servers to a centralized pool of disk storage. Compared to managing hundreds of servers, each with their own disks, SANs improve system administration. By treating all the company's storage as a single resource, disk maintenance and routine backups are easier to schedule and control. In some SANs, the disks themselves can copy data to other disks for backup without any processing overhead at the host
(Storage Area Network) A network of storage disks. In large enterprises, a SAN connects multiple servers to a centralized pool of disk storage. Compared to managing hundreds of servers, each with their own disks, SANs improve system administration. By treating all the company's storage as a single resource, disk maintenance and routine backups are easier to schedule and control. In some SANs, the disks themselves can copy data to other disks for backup without any processing overhead at the host
RAID
(Redundant Array of Independent Disks) A disk subsystem that is used to increase performance or provide fault tolerance or both. RAID uses two or more ordinary hard disks and a RAID disk controller. In the past, RAID has also been implemented via software only.
(Redundant Array of Independent Disks) A disk subsystem that is used to increase performance or provide fault tolerance or both. RAID uses two or more ordinary hard disks and a RAID disk controller. In the past, RAID has also been implemented via software only.
NAS
(Network Attached Storage) A specialized file server that connects to the network. A NAS device contains a slimmed-down operating system and a file system and processes only I/O requests by supporting the popular file sharing protocols, primarily CIFS for Windows and NFS for Unix.
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