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Abstract
I describe the file format of IDL SAVE files, and a set of accessor
routines written in IDL which can read and write SAVE files directly.
Data and compiled functions in an IDL session can be stored on a disk
file, and restored to a new session at a later point in time. The
data are stored using a tag-based format to encourage forward and
backward compatibility. Programmers who wish to implement the ability
to read, write and interrogate SAVE files, and people who are just
interested in ``how it works'' should read this document.
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