As discussed in the Capabilities section, the concept behind DynaSys is
that the screen is a piece of paper on which the user may draw solutions
to differential equations.
Each drawing must be enclosed by a *display rectangle*.
When you type in equations, you receive a default display rectangle, but
you may create new ones at any time, in almost any place on the page.
After you create them, you may move the displays or change their size.

There are many different types of displays available:

- 2-Dimensional Plot Display: This allows you to plot the variation of variable relative to anther, and may be used to display independent versus dependent variables, or pairs of dependent variables. In particular, it is used for phase portraits.
- 3-Dimensional Plot Display: This plots the variation in three variables.
- Iterated Map: This plots the points from a function iteration.
- Stair Step: Use this to create stair step diagrams for iterated functions.
- 2 Point BVP: This provides an alternative to an ordinary 2-d plot for displaying solutions to boundary value problems. It allows you to set boundary conditions easily, while the ordinary 2-d plot uses the mouse to set initial conditions.
- Stereo Pair: Some displays exist only because they are easy. This display produces two separate trajectories in three space, each drawn from a different perspective, with one in red and one in blue. You may use your National Geographic stereo glasses (with one red and one blue lens) to view the result.
- Text: You may place text anywhere on the screen by creating a text display.

- Drawing Display Rectangles
- The Display Dialog Box
- Changing Displays
- Two-dimensional Plots
- Two-point Boundary Value Problem Plots
- Three-dimensional Plots
- Stereo Pairs
- Iterated Functions
- Stair-Step Diagrams
- Direction Fields and Flow Fields
- Initial/Boundary Conditions Dialog
- Parameters Dialog Box
- Equilibrium Points
- Nullclines

Wed Sep 30 15:21:52 PDT 1998