VLIR File Structure

               A VLIR file is a tree structured file.  The directory points
          to a single sector called the VLIR sector.  This sector is a list
          of  the  initial tracks and sectors of each of its  branches  (or
          chains). If the branch address is track $00 sector $FF, then that
          branch  does not exist and is not used.  It is a place holder.  A
          branch  address of track $00 sector $00 specifies the end of  the
          sector. This is used by the OpenRecordFile to count the number of
          branches. It is possible not to have this end marker. That is the
          case  when  there are 127 branches.  This limit of  127  branches
          explains many  of GEOS's limits,  i.e.  127 note  pad  pages,  127
          pictures in a photo album, 64 pages and 63 pictures in a GEOwrite
          file,  etc.  Each branch is the equivalent of a normal file,  i.e.
          each sector points to the next with the first two bytes.

         
          VLIR Sector

          -------------         --------------     --------------
          | Record 1  |-------> | Data Block | --> | Data Block | -> ...
          | Track/Sec |         --------------     -------------- 
          |-----------|         --------------
          | Record 2  |-------> | Data Block | 
          | Track/Sec |         --------------
          |-----------|         --------------     --------------
          | Record 3  |-------> | Data Block | --> | Data Block | -> ...
          | Track/Sec |         --------------     --------------
          |-----------|
          |    .      |
          |    .      |
          |-----------|         --------------     --------------
          | Record 127|-------> | Data Block | --> | Data Block | -> ...
          | Track/Sec |         --------------     --------------
          -------------