Thanks
It is the last version of an example !

cResults = DBGETPROP("table1", "Table", "PrimaryKey")
FOR nCount = 1 TO 254
IF !EMPTY(TAG(nCount)) && Checks for tags in the index
IF UPPER(cResults) = UPPER(TAG(nCount))
? KEY(nCount) && Display Primary Key
EXIT && Found !!!!
ENDIF
ELSE
EXIT && Exit the loop when no more tags are found
ENDIF
ENDFOR