1992 - 1995
       DOS command line program, but all consequent versions are its direct descendants.
       System of syntax trees as a result of parsing.
       26 variables 'a' to 'z' and 26 functions 'A' to 'Z', two constants and set of basic functions.
       Possibility to assign values to variables and assign expressions to functions.
       Values of variables and functions available.

1995 - 1997
       Completely ported to Windows.
       The concept of small calculator introduced.
       Automatical recognition if the symbol is a variable or a function (only 'a' to 'z' symbols).
       Support of differentiations of functions introduced.

1997 - 1999
       Internal syntax tree solving and simplifying introduced.
       The back synthesis (syntax trees -> text strings) introduced.
       Support of polynomials introduced (including root coefficients).
       The graph of a function introduced. Finally.

1999 - 2001
       Displaying of instant values introduced.
       Smooth value shifting and iteration introduced - the moving graph.
       The graph of two functions.
       The web site offered Syntan to the public.

2002 - 2004
       The brand new snowdrop look, more robust code.
       The graph of three functions.
       Smooth adjustment by the knob.
       The tutor instead of help.