Special buttons
===============

   This class consist of the buttons with special functionalities.
These buttons are:

`sto'
     allows you to store the value of the expression currently beingin
     edited in a variable. When you press this button, the following
     message is shown in the value area:

     `choose var. to store:'

     You should now press one of the five variable buttons: if you do,
     the expression will be evaluated, and the result will be assigned
     to the variable you chose. If you press any other button, instead
     of a variable one, there is no effect.

`cpy'
     this button allows you to insert, in the expression you are
     editing, the value of the preceding evaluation, visible in the
     value area.

`get'
     this buttons allows you to copy a text from the Amiga clipboard, to
     the edit area. In this way you can cut an expression from an
     application, and inport it to `ARcalc', ready to be evaluated. You
     can do the same using the `Paste Expression' item in the
     `Clipboard' menu.

`put'
     this buttons allows you to copy the value visible in the value area
     to the Amiga clipboard (as a string). In this way you can cut the
     result of an evaluation from `ARcalc', and paste it in an other
     application. You can do the same using the `Cut Result' item in
     the `Clipboard' menu.

`='
     by pressing this button, you start the expression evaluation. If no
     syntax/evaluation errors are encountered, the result will be shown
     in the value area, otherwise an error message will be shown in the
     same area. Note that, depending on the `AutoCLR' flag, the
     expression text may or may not be cleared after the evaluation.
     The `AutoCLR' flag value can be changed using the `AutoCLR' item
     in the `Setting' submenu of the `Project' menu (see  ARcalc menus.)