Menus

There are four main menu items:

Clicking "File", exposes the following submenu commands:

"New System", which deletes the existing ODEs, and starts afresh.
"Open System", which loads from disk the ODEs from a previously saved Systems file (with extension "syw"). The current ODEs are overwritten by the loaded ODEs, and lost.
"Open Environment", which loads from disk the ODEs and the graphical environment from a previously saved Systems file (with extension "env") and opens the Plot 1 window using the graphical environment. The current ODEs are overwritten by the loaded ODEs, and lost. (The environment includes such things as the variables selected for the axes, the maximum and minimum for these variables, and the selected tab.)
"Save System", which saves to disk the existing ODEs to a Systems file with extension "syw".
"Edit System", which allows you to edit the existing ODEs.
"Exit", which closes Systems.

Clicking "Operations", exposes the following submenu commands:

"Numerical Methods", which automatically opens the Numerics Window.
"Plot in 1 Window", which automatically opens the Plot 1 Window, which plots numerical solutions in one graphics window.
"Plot in 2 Windows", which is under construction
"Plot in 4 Windows", which is under construction.

Clicking "Options", exposes the following submenu commands.

"Hide Tooltips". If unchecked the tooltips are visible, otherwise hidden.
"Help from Web". If unchecked when Help is used, Systems looks for the Help file Systems.chm on your local disk. If checked when Help is used, Systems opens your browser and looks for the Help files from the web. The Help files contain identical information.
"Font size". Selecting this opens a window that allows you to change the font size and boldness in the equation and expression text boxes. The effect is immediate. This option is useful when projecting the screen in a classroom.

Clicking "Help", exposes the following submenu commands.

"Help", which opens this Help file either from your local disk, or from the web, depending on whether "Help from Web", under the "Operations" menu, is unchecked. The Help files contain identical information.
"Webpage", which opens a browser at a user-selected webpage, in this case the Home page of Math 355 at the University of Arizona, "http://math.arizona.edu/~cushing/355.html". When Systems runs, it checks to see whether the text file "webpage.ini" exists (in the same folder as "systems.exe"). If it does not exist, this menu item is absent. If it does exist, the first line of this file is the URL used when "Webpage" is clicked. The second line is optional, and if included is appended (between brackets) to "Webpage" in the menu, which in out case leads to "Webpage (Math 355 Homepage)". Thus, our "webpage.ini" file reads:
http://math.arizona.edu/~cushing/355.html
Math 355 Homepage
For instructions on how to edit this file, see the FAQs.
"Credit", which opens the Credits page of the Help file either from your local disk, or from the web, depending on whether "Help from Web", under the "Operations" menu, is unchecked. The Credit files contain identical information.
"About", which contains copyright informations and the version number.