Answer Posted / kartikeya bommuluri

Field strings are a special form of dynamic string, which
have all the capabilities of a dynamic string, but may also
represent a defined part of a random file buffer or a
defined part of a dynamic string.

Field strings must always be declared using LOCAL.They may
be used in the same manner as a dynamic string variable, or
they can be bound to a file buffer for an open random-
access file or a dynamic string using a corresponding FIELD
statement. Each field string occupies sixteen bytes of
memory, and requires slightly more general overhead than a
regular dynamic string variable

The TABLES statement automatically defines a field string .
they are mainly used in screen painter.

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