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SICStus Prolog streams are divided into two categories, those opened by see/1 or tell/1 and those opened by open/[3,4]. A stream in the former group is referred to by its file specification, while a stream in the latter case is referred to by its stream object (see the figure “Categorization of Stream Handling Predicates”). For further information about file specifications, see ref-fdi. Stream objects are discussed in ref-iou-sfh-sob. Reading the state of open streams is discussed in ref-iou-sos.

Each operating system permits a different number of streams to be open.

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