I can't tell you exactly where it is in the manual, but you can use the same field
modifiers (TOTAL, CALC, BREAK.ON, etc.) and field qualifiers (FMT, CONV, COL.HDG, AS,
etc.) with EVAL as you can with named fields.
Field qualifiers, in particular, override dictionary specifications for named fields,
or supply them for EVAL expressions.
AS gives the EVAL expression a "field name" that can be used elsewhere in the sentence.
CONV specifies a conversion specification.
COL.HDG specifies a column heading. Multi-line with 'L', e.g. COL.HDG "Post'L'Code"
FMT specifies a formatting specification.
SINGLE.VALUE specifies that the field will be treated as single-valued.
MULTI.VALUE specifies that the field will be treated as multi-valued.
ASSOC places the (multi-valued) field into an existing association.
ASSOC.WITH places the (multi-valued) field into a temporary association with another
multi-valued field.
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