EDS LAYOUT ?

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I'am trying to figure out the layout and constuction of EDS
but the documentation is very poor in discribing the construction
and layout.
   I don't understand what this -4 offset means ?
--    block of table headers: 
--                 -4: allocated size of this block (for possible  

   How the tables and table headers tie into the database
   main header ?

   How did RDS come up with value 19 pointer in the following code
   in db_create routine ?  

    -- 3:
    put4(19)  -- pointer to tables

   I would like to understand the internal layout of the
   database better than the confusing discription at the
   top of the database.e. The description does not explain
   how the tables and headers are linked together.

Bernie

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