VFP 7 and 9

I looked in the help file and I am not sure about what happens.

In the data environment I have "csitecode = gcsitecode" for tables A and B where csitecode is a field in a table and gcsitecode is a variable that defines which site the user is at. The existing program has code like

SCAN a.field != b.field
   code
ENDSCAN

my question is does the scan command honor the filters in the Data Environment or do I need to change the SCAN command to

SCAN a.field != b.field AND a.csitecode = b.sitecode
   code
ENDSCAN

Any help appreociated.