Private IP Address

                       The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets (local networks):

10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.255

192.168.0.0 - 192.168.255.255

These IP's should not be used on the Internet.

                 I usually use 192.168.0.1, 192.168.0.2, etc. and a subnet mask of 255.255.255.0 when assigning static IP addresses to computers on a small Local Area Networks (LANs).  If a DHCP server is also on the LAN it's scope (range of IP addresses that it can assign to computers on the LAN set to obtain their IP addresses automatically) should be adjusted so it does not interfere with locally assigned static IP addresses.

Wearable Computers

           Computer technology has played an important role in businesses throughout the years. There has been active development of increasingly portable computer hardware.The development originated with desktop and laptop units and is becoming increasingly apparent in palmtop, handheld and now wearable computers.

Sometimes the location of a desktop or laptop computer is inconvenient or inefficient. When accurate information is not available in a timely manner, production decreases. This is a problem for many businesses throughout the world. With rising costs and and demand for increased efficiency, wearable computers give  personnel real-time access to critical information.

The wearable computer provides the ultimate in network access-- hands-free, heads-up operation with complete mobility and ample computing power. Now personnel can connect to enterprise information systems without interrupting their work. With the convenience of voice activation and head-mounted or touchscreen display options, they can meet their ever-broadening responsibilities, supported by immediate access to on-line manuals, catalogs, parts  list, drawings, supplier information, work forms etc.

Input Devices

            Input devices enable data to be fed the computer in a from that the computer can use.Input devices are categorized into two types.

            1. Keyboard entry devices

            2. Direct entry devices

A device through which data can be entered to the computer by pressing keys is called a keyboard entry device whereas all the other types of input devices are called direct entry devices.

Keyboard

           The keyboard is the most commonly used input device and has been used since computers were first introduced.They are intelligent devices and contain their own chips.Each key is a switch,which closes when that particular key is pressed.The microprocessor scan the keyboard hundreds of times a second to see if a key has been pressed; if it has,a code that corresponds to that key is sent to the Processing Unit.The CPU then translates this code into the ASCII code (the code that computers use to represent charaters on the computer keyboard), which is the used by the computer program.

Mouse

             Mouse movements on the desktop are translated into digital information,which in turn is fed to the computer,causing the cursor to move on the screen.Underneath the mouse there is a ball which rotates when the mouse is moved by the user and sensors pick up this movement.A mouse usually has two or three buttons,and these are used to make selections on the screen.

                                                   

Microphone

             A microphone can be used to record sound into a computer.Microphones are also used for voice communication through a computer.

Camera

                   Digital cameras store the images digitally rather than on film.Digital still cameras can be connected to a computer and the pictures taken on them can be transferred while digital motion cameras or web cams can be used to create video and for video conferencing purposes.

                             

Scanner

                 Scanner are input devices normally used to scan pictures.The scans are then stored in a computer’s memory where they can then be accessed and modified using a desktop publishing package,befor being printed.Both black and white,and colour scanners are available.