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+* What is it?
+
+A library, and set of applications for manipulating duodecimal (base-12)
+numbers.  The library provides mechanisms for adding, multiplying, subtracting,
+and dividing numbers.
+
+The Base package provides tools for manipulating numbers in any base; see the
+DuoDecimal.hs file for example usage.
+
+In addition to the Haskell library, this project provides a GUI RPN calculator
+as well as a command line tool for conversions and for evaluating expressions
+containing duodecimal numbers.  The RPN calculator requires GTK2 and the Haskell
+library gtk2hs.
+
+
+* Building:
+
+
+** RPN GUI:
+
+*** Dependencies: gtk2hs
+
+  ghc --make -isrc -odir out -hidir out -o duodecimal src/Control.hs
+
+*** Usage:
+
+  Run ./duodecimal.  The calculator understands duodecimal numbers (10 => A, 11
+  => B), *, /, +, -, and Backspace.  Backspace pops the top item from the stack;
+  the other keys are evaluated in-line.
+
+*** Bugs, Caveats:
+
+  The GUI isn't terribly smart.  It doesn't handle exceptions very well, such as
+  trying to pop from an empty stack, or trying to perform a calculation on an
+  insufficient number of arguments.  It also won't be very happy to receive
+  ill-formed numbers; basically, there's very little error checking.
+
+  The calculator only takes floating point numbers out to 10 decimal places; you
+  can change this in DuoDecimal.hs.
+
+
+** Command line:
+
+*** Dependencies: None
+
+  ghc --make -isrc -odir out -hidir out -o dd src/Main.hs
+
+*** Usage:
+
+  Run ./dd without arguments for help.
+
+*** Bugs, Caveats:
+
+  None.  Poorly formatted numbers (too many decimals, illegal characters)
+  result in cryptic error messages.