These constants are used with several of the file handling procedures
     to test, set, and clear file attribute variables.

                         ReadOnly    = $01;
                         Hidden      = $02;
                         SysFile     = $04;
                         VolumeID    = $08;
                         Directory   = $10;
                         Archive     = $20;
                         AnyFile     = $3F;

     These constants are addictive in nature, for instance; to locate all
     readonly and hidden files the call

              FindFirst('*.*', ReadOnly + Hidden, FRec)

     would be used. ( FRec is of type FileRec )