Satellite earth station
Earth station is a telecommunication installation that is used to maintain communication link with artificial satellites. Earth station also used to control satellites. For instance, orbital adjustment. Sometimes satellite requires to change the orbit and it is accomplished from ground by the earth station. Earth station of TV station is used to uplink their programs. These programs then rebroadcast to other receiving stations. Nowadays customized version of a large earth station commonly known as VSAT is utilized to establish Internet connection at any place within a short span of time. VSAT is bi-directional that means it can upload and download contents. Large earth stations usually communicate in C band whereas small diameter VSAT communicate in Ku band (although many VSTAs communicate in C band).
PC not responding!
If a program or window on your PC seems to have frozen up and you cannot close it by clicking the X (Close) button in the top-right corner, hold down the CTRL and ALT keys together and tap DELETE once.
In Windows Task Manager click on Applications which shows all the programs that are currently running. You can usually tell which program has frozen or crashed as its Status will appear as Not responding. Click to highlight that program on the list then click on End Task. The PC will now attempt to close it. If it is successful you can then close Task Manager and the PC should be able to carry on as normal.
If Task Manager does not appear, try holding down CTRL, ALT and DELETE and keeping all three keys held. This will restart your PC, which will often fix the problem. If these keys don't work, you will have to press and hold the power switch or turn the plug off. Turn the PC back on. Your PC should be alright but always try to avoid switching off without shutting down properly first.
CTRL + END - go to end of current document
PAGE UP - move up through current document or web page
PAGE DOWN - move down through current document or web page
PRINT SCREEN - take snapshot image of current screen
Compiled By Edward Apurba Singha, Computer Engineer
(R) thedailystar.net 2007