1. Function

The function must be in terms of x 
only:  f(x).

It can contain:

- The variable x
- Any real or integer constant
- p (for PI)
- e (for 2.7182818)
- Any function abreviation listed in 
  the function dialogue box

The function must be entered in POSTFIX  
notation. i.e.: you can view the 
function as being evaluated from left to
right. And each time a number or a 
variable is read, it is placed on top of a 
stack. And each time an operator is read
it is applied to the last two or one 
numbers placed on the stack. Then the 
result of the operation is placed on top
of the stack. This method is identical
to the one used some scientific
calculators. There must be at least one
space character between each element of
the function.

examples:

__________________________________
    infix        |     postfix
_________________|________________
 (3x + 2)        |     3 x * 2 +
_________________|________________
 x raised        |
 to the power    |
 of 3            |     x 3 ^
_________________|________________
 sin(x+2)        |     x 2 + s
_________________|________________
 abs(cos(3*x))   |     x 3 * c a
_________________|________________
 -x              |     x -1 *
_________________|________________
 x modulo 5      |     x 5 m
_________________|________________

Note: To obtain -x, multiply x by -1

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2. Interval

xa,xb,ya,yb can be any real number where
xa < xb and ya < yb

The numbers can be in decimal or exponential
notation.

examples of valid numbers: 2
                           34.99875
                           2.1E-10

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3. Wider

This menu option will enlarge the x and y 
range by a factor of two

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4. Zoom

This menu option permits to restrict
the graphic interval. Press the left mouse
button and drag the mouse while holding the
button.

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5. Superimpose, New

Superimpose will draw the current function
without erasing the screen. New erases
before drawing.

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6. Printing

The Print option will send the graphic on
the screen to the printer selected by the
Windows control pannel. 
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7. Copy 

This option copies the current graphic 
window to the clipboard. The contents of the
clipboard can then be pasted in other Windows
graphics programs.
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8. Origin

This function will redraw the current graphic
without changing the interval size but centered
at the origin.             

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9. Save, Save as, Open

These functions will save or load a graphics 
definition file containing up to ten distinct
curves. 
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10. Coordinates

The current coordinates of the mouse pointer
are displayed on the screen.
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