On personal computers, the key can be used by software in several different ways, such as to switch between multiple login sessions, to terminate a program, or to interrupt a modem connection.

On the Sinclair ZX80 and ZX81 computers, the Break is accessed by pressing Space.

On personal computers and small workstations, the CPU is housed in a single silicon chip called a microprocessor.

On November 2, 1988, Robert Tappan Morris, a Cornell University computer science graduate student, unleashed what became known as the Morris worm, disrupting an estimated 10 % of the computers then on the Internet and prompting the formation of the CERT Coordination Center and Phage mailing list.

On Windows computers, extensions consist of a dot ( period ) at the end of a file name, followed by a few letters to identify the type of file.

On Apple Macintosh computers, there are keyboard shortcuts for the most common diacritics ; Option-e followed by a vowel places an acute accent, Option-u followed by a vowel gives an umlaut, option-c gives a cedilla, etc.

On computers, the availability of code pages determines whether one can use certain diacritics.

On the Apple II, unlike modern computers that use standardized device drivers to manage device communications, the operating system directly controlled the step motor that moves the floppy drive head, and also directly interpreted the raw data called nibbles read from each track to find the data sectors.

On Atari 8-bit computers, the most common protection method was via " bad sectors ".

On 7 April 1986 Amstrad announced it had bought from Sinclair Research "... the worldwide rights to sell and manufacture all existing and future Sinclair computers and computer products, together with the Sinclair brand name and those intellectual property rights where they relate to computers and computer related products.

On meters that allow interfacing with computers, optical isolation may protect attached equipment against high voltage in the measured circuit.

On modern general purpose computers, this can take tens of seconds and typically involves performing power-on self-test, locating and initializing peripheral devices, and then finding, loading and starting an operating system.

On shared computers, whether time-sharing, batch processing, or server systems, core dumps allow off-line debugging of the operating system, so that the system can go back into operation immediately.

On the other hand, laptop computers offer portability that desktop systems can not due to their small form factor.

On the first computers, with no operating system, every program needed the full hardware specification to run correctly and perform standard tasks, and its own drivers for peripheral devices like printers and punched paper card readers.

On computers and data links using 8-bit bytes this left the top bit of each Byte free for use as a parity, flag bit, or meta data control bit.

On January 12, 2010, Google reported a large cyber attack on its computers and corporate infrastructure that began a month earlier, which included accessing two Gmail accounts and the theft of Google's intellectual property.

On computers running Mac OS X, disk images are now ubiquitous for software downloads, typically downloaded with a web browser.

On personal computers, SLIP has been largely replaced by the Point-to-Point Protocol ( PPP ), which is better engineered, has more features and does not require its IP address configuration to be set before it is established.

On the second day of the contest, when users were allowed to physically interact with the computers ( the prior day permitted only network attacks ), Charlie Miller compromised Mac OS X through an unpatched vulnerability of the PCRE library used by Safari.

On present-day computers, performance is determined more by cache and CPU pipeline considerations than by strict operation counts, and a slight difference in arithmetic cost is unlikely to be significant.

On September 4, 2008, Sony announced a worldwide voluntary product inspection and rework program for TZ-series notebook computers manufactured since June 2007.

On affected Vaio notebook computers, the cooling fan will start to make an unusual noise.

On the other hand, it is argued that as chess enters certain endgames, databases must be employed by computers to deal with added complexities.

On Fridays, the day when many Persians relax with poetry, talk, and a samovar, people do not, it is true, stream into Chehel Sotun -- a pavilion and garden built by Shah Abbas 2, in the seventeenth century -- but they do retire into hundreds of pavilions throughout the city and up the river valley, which are smaller, more humble copies of the former.

On these posts the gates swung open with a squeak and shut with a metallic clang.

Calhoun dealt with this question in his `` Disquisition On Government ''.

On the eve of his return to their native Naxos he speaks with his wife of the masterpiece which rises before them in its completed perfection.

On Sundays, with the permission of Captain Heard, who usually attended with two of his officers, services were held in the double cabin.

On arrival at headquarters he had, however -- in King Stanislas' words to Glayre -- `` found such favor with Pe Potemkin that he made him his aide-de-camp and up to now does not want him to go join Paul Jones.

On the morning of November 17th, Cornwallis and 2,000 men had left Philadelphia with the object of capturing Fort Mercer at Red Bank, New Jersey.

On the other hand, the consensus of opinion is that, used with caution and in conjunction with other types of evidence, the native sources still provide a valid rough outline for the English settlement of southern Britain.

On January 4, with the boys back at school and college, Mrs. Lewis wrote Harcourt to say that she was `` through, quite through ''.

On the other hand, the bright vision of the future has been directly stated in science fiction concerned with projecting ideal societies -- science fiction, of course, is related, if sometimes distantly, to that utopian literature optimistic about science, literature whose period of greatest vigor in the late nineteenth and early twentieth centuries produced Edward Bellamy's Looking Backward and H. G. Wells's A Modern Utopia.

On the contrary, the frenzy and furor of combat is only the sombre foil against which the sudden illuminations of the human flash forth with the piercing radiance of a Caravaggio.

On their right rose the embankment covered with brush and trees.

On the other side of the church was a quiet, well-kept house with shutters and recently painted.

On Sundays he would walk miles into the campagna to visit with them, and in particular to see their horses.

On the east side of the island of Manhattan the indifferent hawk knew the East River that connected New York Bay with Long Island Sound.

On ships at sea, on railroad trains, in summer hotels with mountain views, they always said, `` I've never done this before ''.

On the other hand, it is no interference with sovereignty to point out defects where they exist, such as that a plan calls for factories without power to run them, or for institutions without trained personnel to staff them.

On September 16, Sam Rayburn will have served as Speaker twice as long as any predecessor and I am proud to join with others in marking this date, and in expressing my esteem for that notable American, Sam Rayburn.

On April 25, the White House reported that a total embargo of remaining U.S. trade with Cuba was being considered.

Held: On the record in this case, the administrative procedures prescribed by the Act were fully complied with ; ;

On the remainder of the clear channels, the dominant ( class 1 ) -- B stations are protected as described above, and the relatively small number of secondary ( class 2 ) ) stations permitted to operate on these channels at night are required to operate directionally and/or with reduced power so as to protect the class 1, stations.

On the basis of what they give us we can know how the young Caruso sang, appreciate the distinctive qualities of Parsifal under Karl Muck's baton, or sense the type of ensemble Toscanini created in his years with the New York Philharmonic.