[Description]
Calc/calc and calc/computer link interface routines

[Bottom]
<B>Note:</B> Some functions from this header file are straightforward and quite simple to use, but
some of them require good knowledge of TI's communication protocols (much better than my
knowledge about it, so don't ask me about details; protocol information can be found at
<A HREF="http://www.ticalc.org/pub/text/calcinfo/tixx_guide.zip">http://www.ticalc.org/pub/text/calcinfo/tixx_guide.zip</A>).
