function tt:_open

When Tool&Task is started, 3 tables are opened by tt_open() and kept open during the complete session.

<gUserDataTT>hfiles\defines.dbf in select(1)

<gUserDataTT>hfiles\tt_prot.dbf in select(2)

<gUserDataTT>hfiles\printers.dbf in select(3)

If you want to close these files in your program, use the command tt_close() and, when your procedure has finished tt_open() again.