Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Transparallel processing is a form of processing, in computing or otherwise, in which items are processed simultaneously by one processor. Transparallel processing complements the three forms of processing called: subserial processing, in which items are processed one after the other by many processors; serial processing, in which items are processed one after the other by one processor; parallel processing, in which items are processed simultaneously by many processors. Various everyday situations involve some combination of the latter three forms of processing. For instance, at the checkout in a supermarket, the cashiers work in parallel, but each cashier serially processes customer carts that are presented subserially by the customers.