Parameters

 Keyword  Posn  Type        Description
 -------  ----  ----        -----------
 INP1      1    CHARACTER   First input data object.
 INP2      2    CHARACTER   Second input data object.
 OUT       3    CHARACTER   Output data object.
   -> GLOBAL.BINDS (the current binned dataset)
 OPER      4    CHARACTER   Type of operation (+,-,*,/).
 ERROR1    5    CHARACTER   Error estimate for first primitive
                            data object.
 ERROR2    6    CHARACTER   Error estimate for second primitive
                            data object.
 OVER      -    LOGICAL     If set then the INPUT1 dataset
                            becomes the output dataset too.
 ERRORS    -    LOGICAL     If set then the user is prompted for
                            input dataset errors if these are not
                            yet present.