Thank you for replying.

But in this case, I want to prevent the record updated by another computer.
Exam:
Step 1:
+ Computer 1: SET FILTER TO id = 'A'
+ Computer 2: SET FILTER TO id = 'B'
Step 2:
+ Computer 1: INSERT INTO tb1 VALUE ('A')
+ Computer 2: INSERT INTO tb1 VALUE ('B')
Step 3:
+ Computer 1 : =TABLEUPDATE(.T.)
And I don't want to see the record update by the first computer in the second computer