Compiler device for optimizing program which manipulates a character string includes append instruction detection unit, store code generation unit, and append code generation unit. In an illustrated embodiment, a selected capacity is reserved for voice calls, in contrast to data calls. The bags are produced in registered bag stacks and include means for adhering a rear surface of one bag to a front surface of a subsequent bag making the bags self-opening when used in dispensing rack. The system may be combined with a standard, advanced or video baby monitor.