function tt:_close()

tt_close() will close defines.dbf and tt_prot.dbf. It can be used as the first command in your program to be run under Tool&Task. Since other Tool&Task functions might need the two tables, we only recommend to use tt_close(), when you need to make sure, these files are not open. (e.g. you want to copy them elsewhere). If you use tt_close(), please insert tt_open() as well to make the tables available again for Tool&Task.