1. Apparatus, comprising: computer-readable media; and computer-readable code, stored on the computer-readable media, including, code to allocate at least one data structure in computer memory, the at least one data structure having a plurality of message parameter fields, and each of the message parameter fields having a deterministic position within the at least one data structure; code to navigate to different ones of the message parameter fields by interpreting non-compiled instructions, the instructions having a form that specifies i) a position of a particular message parameter field within the at least one data structure, the position being specified in terms of a number of data offsets in the at least one data structure, and ii) a number of bits in the particular message parameter field; and code to configure a communications test-set to emulate a communication network following navigation to at least one of the message parameter fields.