>I run two the program in the same time, both of them use the same *.dbf files, the problem is when I close one of the program, it close all of the tables, so when I go to the next program, the program can not find the tables .. why ??.. I use THISFORM.RELEASE command in the "close" icon

If your form's detasession is set to 1-default and your tables were opened outside the form, you are really in trouble. That's the reason why we set form's datasession to 2-private and opening tables is via Data Environment so that tables will be opened in a separate sessions.