>how i open a cursor twice?

This use 3 workareas:

* a cursor have exclusive access, then it can live only within a datasession only
CREATE CURSOR birobiro ( ... )
INDEX ON ... TAG taggo
USE DBF() AGAIN IN 0 ALIAS birobiroTrue
USE DBF() AGAIN IN 0 ALIAS birobiroFalse

Of course, 2 workareas (birobiro and birobiro1) are sufficient for to split birobiro in two disjoint sets.

aaahhh, you don't open the cursor twice, you open it one time only,
and with USE create two status context for the same opened cursor.

Fabio