Syntax

  key of referents ([ numeric-expression] | this referent)

Obtains the key of a particular referent. The numeric-expression represents the position of the to-be-accessed referent on the referents shelf.

In a simple program, the "n"th value on the referents shelf is the "n"th mentioned in the program. However, if a stream bound to a referent is discarded while open, that referent is removed from the shelf, and the positional values of some of the referents may change.

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