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+GRPN is a graphical reverse polish notation (RPN) calculator.
+GRPN is written in C and uses the GIMP Toolkit (GTK) on top of X11. GRPN
+was developed under Linux but has also been tested under SunOS and Solaris.
+It should work with almost any UNIX, though. GRPN works with real numbers
+and complex numbers. Numbers can be displayed in 4 different radix modes,
+and complex numbers can be displayed in either Cartesian or polar form.
+
+GRPN uses a stack and reverse polish notation to evaluate expressions. The
+stack in GRPN is infinite and limited only by available memory.