A tearing guide strip 23 is integrated with a base part 21a or 21b of at least one of a male member 2a and a female member 2b constituting a zipper 2 in a peelable manner to improve the tearing unsealing ability of a zipper-equipped bag provided with an interlocking type zipper enabling resealing and unsealing after the bag is unsealed. In the portable devices, local browsers are run to find services by listening in the local area network to messages broadcast from a local information server through some base unit. In some embodiments the sputtering target material contains Na, S, or Se. The magnetic field generator may include permanent magnets of varying intrinsic coercivities andor remanences.