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used computer saleEnvironmentalismEnvironmentalism is a broad philosophy and social movement centered on a concern for the conservation and improvement of the natural environment, both for its own sake as well as its importance to civilization. Environmentalists frequently speak of a planet or place faced with a plethora of grave and urgent threats; often associated with unbridled consumption, economic growth, materialism, insensitive development, and booming human numbers. Perhaps most problematic from an environmentalist perspective is the modern view that humanity's fate is divorced from that of the natural world, and that our responsibility to nature is - at best - limited to the satisfaction of shallow desires. In various ways, environmentalists and environmental groups seek to give the natural world a stronger voice in human affairs and struggle to make governments, industry and other institutions see the importance of ecology and to treat nature with greater respect. Many environmentalists see common cause with indigenous communities and other marginalized groups struggling to protect their traditional way of life or freedom from blind commerce and other global incursions. Wiki Environmentalism free computer recycling free computer recyclinglaptop computer laptop computer laptop computers laptop computers notebook computers notebook computers old computer old computer old computers old computers recycle computers recycle computers recycling computers recycling computers refurbished notebooks refurbished notebooks refurbished pc refurbished pc surplus computers surplus computers used computer used computer used computer equipment used computer equipment used computer games used computer games used computer hardware used computer hardware used computer sale used computer sale used computers used computers used desktops used desktops used laptop computer used laptop computer used laptop computers used laptop computers used laptops used laptops used notebook computers used notebook computers used notebooks used notebooks used pc used pc wholesale computer wholesale computer |
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ProgramsIn practical terms, a computer program might include anywhere from a dozen instructions to many millions of instructions for something like a word processor or a web browser. A typical modern computer can execute billions of instructions every second and nearly never make a mistake over years of operation. Large computer programs may take teams of computer programmers years to write and the probability of the entire program having been written completely in the manner intended is unlikely. Errors in computer programs are called bugs. Sometimes bugs are benign and do not affect the usefulness of the program, in other cases they might cause the program to completely fail (crash), in yet other cases there may be subtle problems. Sometimes otherwise benign bugs may be used for malicious intent, creating a security exploit. Bugs are usually not the fault of the computer. Since computers merely execute the instructions they are given, bugs are nearly always the result of programmer error or an oversight made in the program's design. In most computers, individual instructions are stored as machine code with each instruction being given a unique number (its operation code or opcode for short). The command to add two numbers together would have one opcode, the command to multiply them would have a different opcode and so on. The simplest computers are able to perform any of a handful of different instructions, the more complex computers have several hundred to choose from—each with a unique numerical code. Since the computer's memory is able to store numbers, it can also store the instruction codes. This leads to the important fact that entire programs (which are just lists of instructions) can be represented as lists of numbers and can themselves be manipulated inside the computer just as if they were numeric data. The fundamental concept of storing programs in the computer's memory alongside the data they operate on is the crux of the von Neumann, or stored program, architecture. In some cases, a computer might store some or all of its program in memory that is kept separate from the data it operates on. This is called the Harvard architecture after the Harvard Mark I computer. Modern von Neumann computers display some traits of the Harvard architecture in their designs, such as in CPU caches. Programs |
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