A computer generates encoded information to associate a physical package to a transaction. The ionizable composition including at least zinc or at least one zinc compound or both. The flip chip interconnect is provided with an underfill. Furthermore, the maintaining of the two optical states requires no voltage, which does not require the use of a high voltage to destabilize the helical structure of the cholesteric liquid crystal, and does not have to go through a metastable stage. Alternatively, an administrator may decide whether the user may interact with the source of the electronic communication. The method further includes transmitting, when there are at least four streams, a fourth stream with a cyclic shift delay relative to the other of the first and second stream equal to a quarter of the period.