Is there anyway of creating a global field that is kept in the database?

I currently have someone dedup the database by a number 1 - 20000. But once the database is closed I need it to remember at which number it was at so that it can return to this?

Any help would be great!

The values in Global fields are saved in the database when it's closed, with two exceptions:

• - performing a Save As A Copy with the "Clone (no records)" option deletes all data from the file, including whatever is stored in the Global fields.
  
  - when using database via a network (either with FileMaker Server or FileMaker's file sharing) only the data in the HOST computer's Global fields are saved.

The way around this second problem is to use a separate related file to store your "global" data as a normal record / non-Global field. That way it is still accessible by all computers on the network AND will save whichever value was last changed to by any of them.