_BITARRAY           Bit array pointer
 _BREGS              Byte register structure
 _BRKEXEC            Breakable code execution function type
 _BRKRECOVER         Breakable code recovery function type
 _DBECONFIG          Database browse configuration structure
 _DBEDISP            Database browse display function type
 _DBEKEY             Database browse keypress function type
 _DBESET             Database browse settings structure
 _ECRIT              Critical error information structure
 _FILESELFUNC        File selection callback function type
 _FLDBAG             Database field replacement structure
 _HFILE              File handle
 _HSCR               Saved screen handle
 _IDXFUNC            Index expression function type
 _LIST               Generic list pointer
 _MENU               Menu pointer
 _PALIAS             Alias pointer
 _PCVT               Printer character converter function type
 _POINTER            Memory pointer
 _REGS               Word register structure
 _SLIST              String list pointer