INTLPOP divides the screen into areas called 'windows.' A window is any rectangular region of the screen.

The main screen for INTLPOP consists of two large windows, called 'Simulation Windows'. You can compare two countries at the same time by running simulations in the two windows.

A small message window along the bottom of the screen tells you what you can do at any moment in the program.

At first, the two simulation windows contain no information. Before you can run a simulation, you must choose a country for one (or both).

The two simulation windows are controlled seperately. Press the 'Options' button of the window in which you want to start a simulation. A menu will appear listing five options. To select a region/country, press:

   Select region/country for simulation.

A window will appear which contains two maps of the world and a list of regions/countries.

For information on the other four options, read the 'Options Help' information under the 'Help' menu.

The regions and countries are in alphabetical order. To select a region or country, simply move the arrow over the name you want and press the left mouse button. Your selection will appear under the label 'Current Selection:'.

Press 'Done' to complete the selection. You can change your selection any time before you press 'Done.'

To select from the maps, move the arrow to a region/country and press the left mouse button. The name of your selection will appear under the label 'Current Selection.' Press 'Done' to complete the selection. Before you press 'Done,' you can select a different region/country.

There are actually two maps:

• Regions of the World - in the upper left;

  shows the whole world.

• Countries of the World - in the bottom left half of the screen;

  this is a closeup view from part of the Regions Map.

Press either of the two scale buttons, '+' and '-', to zoom in or out on the Countries map.

Along with the name of the region/country that you picked and its 1990 population, the following information will appear in the main display:

• The Population Pyramid represents the 1990 age distribution. It appears on the left.
• Birth and Death Rates appear to the left and right of each age group in the pyramid.
• Infant Mortality is shown in the lower left of the window.
• Three Parameter Buttons: Total Fertility, Life Expectancy, and Net Migration appear in the lower middle.
• Initial and Current Population will appear in a box to the right of the population graph.

Now read the remaining HELP menu items to learn how to simulate population growth with INTLPOP.