On Wed, 2010-12-15 at 04:39 -0600, Bongo wrote: > - serial ports are not locked when open - CreateFile( "\\.\com1" ... ) > with exclusive access does not lock the resource for other open > attempts. > Some programs don't use the symlinks in dosdevices: I use one that can access all six of my serial ports with no COMn entries in dosdevices. Martin