You know, back in Vietnam, POW's developed a fairly complicated, but fluid code that could be used in a variety of ways from taps to coughs and snorts to humms and so on. It was quite effect at transfering information between themselves and the outside world during the rare recorded and broacasted propaganda efforts of the North Vietnese... It was a sort of grid system, if I recall, involving 25 letters and sounds made to identify characters or phrases.<br/><br/>As an example, A might be a cough followed by a sniff, a F two quick coughs and a snort... Not great for fast communications though.<br/><br/>Anyway, the point is that a language doesn't have to be used so much as just a set of quick things to convey concepts. "Behind and right!" might be just a "Grok!" or something.