The present invention enables a game server to provide hosting services by connecting the game server device to a peer group, notifying at least one member of the peer group of the availability of the server device, and enabling the server device to accept and respond directly to searches for the hosting services, which are directed at the peer group by one or more gaming client devices. Treatment modalities that include addition of the disclosed materials, compositions and systems to pre- and post-construction concrete-containing materials and surfaces are provided. The device is particularly applicable to the detection of gas. The second workpiece holder is detachably fixed to the center pin.