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Although these two are often considered interchangeable, compilers and execution environments usually assign different signals to these. Additionally, in some kernels (e.g. miscellaneous DOS variants) is detected only at the time OS tries reading from a keyboard buffer and only if it's the only key sequence in the buffer, while is often translated instantly (e.g. by INT 1Bh under DOS). Because of this, is usually a more effective choice under these operating systems; sensitivity for these two combinations

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