Long description

The figure shows three layers. Layer 1 is labeled win32 application program, layer 2 is labeled win32 application programming interface and layer 3 has four blocks that are connected to the second layer. The third layer has four blocks, and the first block has two parts the upper part is labeled Win32s and the lower part is labeled Windows 3.0 slash 3.1. The second block is labeled Windows 95 slash 98 slash 98SE slash Me. The third block is labeled Windows NT slash 2000 slash Vista slash 7. The fourth block is labeled Windows 8 slash 10 slash 11.