A triggering mechanism suitable for sequential firing of ammunition from a firearm, wherein the firearm has multiple barrels, preferably two barrels, and the triggering mechanism allows the firing of ammunition sequentially from one barrel, then the second barrel. A rich media presentation is divided into discrete components, and a producer of the presentation specifies how a presentation is to be assembled and where resources needed for the presentation are to be found. The multi-tenant runtime detects a connection between tenants, and then performs low-overhead data transmission mechanisms by cloning data from one tenant space to another tenant space, while keeping the data isolated for two tenants. An extraction pulse is applied to a negative ion extraction electrode to pull the negative ion beam into a negative ion beam path, which proceeds through a first partial vacuum system, through an ion beam focusing system, into the tandem accelerator, and into a synchrotron. The keypad may have multiple positions to which key elements can be attached, with larger key elements requiring multiple positions. Uses of the modified phage and kits containing the phage are also provided.