---
   MODIS()         Interactive Create/Modify Stru
     Usage         modis(<create|modify>,<dbfname|dbflist>
     Param         <create|modify>   = "C" or "M"
                   <dbfname|dbflist> = NAME OF A DBF or ARRAY OF
                                       ALLOWED DBFNAMES

     Notes         Both params are optional. If you just call
                   Modis(), you will be prompted.
                   DBFs should be closed first. Modis() uses the
                   current work area.
                   Use with caution - test it on test data.
                   Ensure there's enough disk space to write out
                   a temp DBF and DBT.

     Example       Modis("M","Customer.dbf")       && modify
                   ..or
                   ..
                   Modis("C","Newfile.dbf")        && create
                   ..or
                   ..
                   Modis("M")                      && select from
                   ..or                            && dbfs in dir
                   ..
                   Modis()                         && all prompted

     INTERNAL FUNCTIONS:
       CHK_COMP()        F2S()             F_NAMEVAL()
       MODIS_FLD()       MODIS_SCR()       MODI_STRU()       MOD_ED()
       MOD_KEYS()        MOD_SAYF()        SETS_OFF()        SETS_ON()