There are two boxes in this example, one on the left and one on the right. There is no connection between these boxes.

The box on the left shows Word for Mac OS (Application Program) at the top with MAC OS Operating System below. Separating these two is a square jagged line labeled API. Right underneath the MAC OS Operating System, separated by a straight line is the Power PC Motherboard.

The box on the left shows Word for Windows (Application Program) at the top with Windows Operating System below. Separating these two is a wavy jagged line labeled API. Right underneath the Windows Operating System, separated by a straight line is the Intel Pentium Motherboard.

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