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Pointer Variables Pointers are a very useful part of efficient C programming. They are variables that store the memory address of other variables.Pointer variables are declared in just the same way that other variables are declared but the variable name is prefixed by a *. It represents the `dereference operator`, and merely denotes that the declared variable is a pointer. The pointer`s data type must match the...... Similar Editorial : by Andrew Baker. | Source : Buy Computer Hard Drives
Data Link Layer The physical layer provides only a raw bit stream. The data link layer attempts to make the physical link reliable and provides the means to activate, maintain, and deactivate the link. The principle services provided by the data link layer to higher layers are those of error detection and error control. Thus, with a fully functional data link layer protocol, the next higher layer may assume error...... Similar Editorial : by Gareth Mailer. | Source : Buy Computer Hard Drives
File Cache Consistency When a file server is used, performance of file I/O can be noticeably degraded relative to local file access because of the delays imposed by the network. Individual systems can use file caches to hold recently accessed file records. Because of the principal of locality, use of a local file cache should reduce the number of remote server accesses that must be made. When a process makes a file...... Similar Editorial : by bgutter. | Source : Buy Computer Hard Drives
Network Layer The network layer provides for the transfer of information between computers across some sort of communication network. It relieves higher layers of the need to know anything about the underlying data transmission and switching technologies used to connect systems. The network service is responsible for establishing, maintaining, and terminating connections across the intervening network. At this...... Similar Editorial : by Rita Fisher. | Source : Wireless Network Software
Operation Of Tcp And Ip The total communications facility may consist of multiple networks, the constituent networks are usually refereed to as sub networks. Some sort of networks access protocol, such as Ethernet logic, is used to connect a computer to a sub network. This protocol enables the host to send data across the sub network to another host or, in the case of a host on another sub network, to a router. IP is...... Similar Editorial : by Ieuan Dolby. | Source : Buy Computer Hard Drives
Suspended Process The three principal states that have been described (Ready, Running, Blocked) provide a systematic way of modeling the behavior processes and guide the implementation of the operating system. Many operating systems are constructed using these three states.There is good justification for adding a additional states to the model. Consider a system that does not employ virtual memory. Each process to...... Similar Editorial : by Hans Peter Oswald. | Source : Buy Computer Hard Drives
Virus Trap Door A virus is a program that can "infect" other programs by modifying them. Modification includes a copy of the virus program, which may infect other programs. Computer virus has similarity with biological virus, a biological virus infects the machinery responsible for the living cell to work and a computer virus carries in its instructional code the recipe for making perfect copies of it.The...... Similar Editorial : by Daiv Russell. | Source : Free Adware And Spyware Removal
Graphics Card As with the motherboard, there are several beep codes relating to faults with graphic cards. The situation here is further complicated by the fact that some of these codes can also imply problems with the system memory. Assuming there is an AWARD BIOS and a sound of one long beep and two short beeps, this would indicate a problem with the graphics card with a less likely possibility of a fault in...... Similar Editorial : by Anthony Thedford. | Source : Buy Computer Hard Drives
Power Trouble Shooting The first thing to establish is whether you have power available to your PC. This principle applies to any item electronic or electrical equipment, not just computers, and in this case is easily established by observation.Are the LEDs (lights) on the system case lit and is the power supply fan blowing? If the answer to any of these questions is yes, then the systems power supply is operational. If...... Similar Editorial : by lynter. | Source : Buy Computer Hard Drives
Undo Recent Changes One of the first things to consider is what were you doing on the PC immediately prior to the fault manifesting itself, If you can identify something specific then very often simply undoing it will eliminate the problem.The easiest way to trouble shoot your PC would be to consider what were you doing prior to the problem occurring? These might be certain cases in which your PC might not function...... Similar Editorial : by David M. Siegel. | Source : Buy Computer Hard Drives
Wired Netwrok Components The key component that is required by every computer or other device that will be connected to the network is a Network Interface Card (NIC) or network adapter. NICs come in a variety of shapes and sizes, designed to connect desktop computers, laptops, PDAs or other devices to the network. The terms network adapter interface card or NIC are all synonymous.If you want to avoid getting the...... Similar Editorial : by Yip See Kit. | Source : C++ Object
Combined Paging And Segmentation Both paging and segmentation have their strengths. Paging, which is transparent to the programmer, eliminates external fragmentation and thus provides efficient use of main memory. Pieces that are moved in and out of main memory are of fixed equal size, it is possible to develop sophisticated memory-management algorithms that exploit the behavior of programs. Segmentation is visible to the...... Similar Editorial : by Anna Woodward. | Source : Buy Computer Hard Drives
Disk Design Considerations Several design issues are of interest. Disk should be designed according to the memory and performance requirements.First, when an I/O request is satisfied from the disk cache, the data in the disk cache must be delivered to the requesting process. Delivery can be made either by transferring the block of data within main memory from the disk cache to memory assigned to the user process, or simply...... Similar Editorial : by Pawan Bangar. | Source : Buy Computer Hard Drives
Disk Input And Output Over the past 30 years, the increase in the speed of processors and main memory has far outstripped that of disk access, with processor and main memory speeds increasing by about two orders of magnitude compared with one order of magnitude for disk. The result is that the disks are currently at least four orders of magnitude slower than main memory.The actual details of disk I/O operation depend...... Similar Editorial : by Pawan Bangar. | Source : Buy Computer Hard Drives
Key Distribution For conventional encryption to work, the two parties or hosts should have the same key, and that key must be protected from access by others. This key may provide encrypted message. Frequent key changes are usually desirable to limit the amount of data compromised if an attacker learns the key. Therefore, the strength of any cryptographic system results with the key distribution technique, a term...... Similar Editorial : by Thomas Cutler. | Source : Buy Computer Hard Drives
