AS THERE ARE VARIOUS DEVELOPMENTS IN THE FIELD OF I.T. IT IS NOT THAT MUCH USEFUL OR EASY TO FIND THOSE INFORMATIONS IN BOOKS. SO THE BEST WAY IS TO SEARCH IN VARIOUS WEBSITES. SOME OF THEM WHICH I KNOW IS: www.directory.com www.answer.com
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If the IT company is publicly traded, you can find a great deal of information in their SEC filings. Most companies make these available on their Web sites, or you can visit a site like Yahoo! Finance or EDGAR. Another option, which is helpful when researching private companies, is to purchase a Business Information report from Dun & Bradstreet or D&B. Some of these reports are even free.
Computers that collect information from all the clients on a network have configuration management software installed. An administrator of a computer network would also be able to collect all information from clients.
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The programs called "spyware" record information about your computer use and forward it to another user, typically one unauthorized to collect this data.
Ushahidi is a crisis mapping tool that can collect information to make it instantly and publically available for use in emergencies. Ushahidi is a company that makes a type of open source software used for information collection, visualization, and interactive mapping.
advantage: through investigation we collect all the information disadvantage: it is very costly