meaning of descriptor

1. descriptor system> An integer, string or other small data value which refers to one of several objects allocated to a program by the operating system, usually the kernel. A common example is a Unix file descriptor which is a small integer that identifies an I/O channel. Another example is a reference to an area of memory e. g. shared memory. Compare capability.
2. a piece of stored information that is used to identify an item in an information storage and retrieval system

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