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 DOS open error 4
------------------------------------------------------------------------------
 This is a DOS error that indicates there are no more handles left to open
 another file. Increase the number of file handles in each of three places:

 . The workstation - FILES=nn in CONFIG.SYS
 . The network - (SHELL.CFG for Novell)
 . The program - some C compilers limit the number of file handles in
   the start-up routine.

 Remember that Blinker requires one file handle per overlay: one for an
 internal overlay or when using external overlays one per SECTION INTO
 command. Also, CA-Clipper 5.x requires a corresponding number of file
 handles for the dynamic paging system.