>Some friends of mine told me that Fox write buffered data to table to avoid data loss before change current form. Would this be right???

That is not right. With record buffering, VFP will commit the modifications when TableUpdate() is issued or the record pointer move or the table is closed. With table buffering, VFP will commit the modifications when TableUpdate() is issued or the table is closed. Skipping from form to form will not commit the modifications, unless record buffering is used and the record pointer is moved or if the table is closed.

>>If you want a maximum of efficiency from this site, you are better off creating a new thread if it's a new question and to address it to All.
>How can I do this?

Click on the blank document icon (the top-left one).

HTH