Methods for generating code sequences that have rapid acquisition properties and apparatus which implement the methods by processing spreading codes on in-phase and quadrature channels. The apparatus includes a first bracket for mounting to a support, and a second bracket associated with the article. The add-on instruction context can include information such as instances of data for particular lines of execution, the add-on instruction called, a caller of the instruction, a location of the instruction call, references to complex data types and objects, etc.