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We queue all the time : at the administration, at the supermarket, at school for lunch.... The first in the queue, will go out first and the last one, well, will be out the last. This is the basic system that many programs use to process commands,functions in a particular order, here the first in, first out order (FIFO). It can be used to create chained effects, delayed remote call to server, sending mails by bunch, etc. We'll see in this entry the underlyings of a queue!