Variables@

   A variable must begin with a letter. It can be composed whith any number of letters,
   digits and of character '_'.

   To change a variable's value, enter it's name in the  input zone
   followed by the equal sign '=' and an expression that can contains other variables too.

   It's possible to affect several variables by separating them by ';'.

   Examples :

                 a1 = 4            -> 4
                 toto = 6          -> 6
                 b = a1 + 3 * toto -> 22

   To see all available variables you can use the Windows->Variables menu item.
   If the  Tooltype USEENV=YES, they will be saved in ENVARC:PSCalc/Variables/.

   It's possible to copy a variable in the  input zone by double-
   clicking on it's line or by simple-clicking on it's line followed by a clic on the
   [OK] button.