Windows SDK & DDK (1986) 70 DOS

The Microsoft Windows Software Development Kits (SDK) provide sample program code, extra libraries, and documentation to aid application developers producing Windows applications. Microsoft Windows Driver Development Kits are similar sets of samples and libraries but specific to device driver development, and much more in-depth.

• Windows 2.x

Workgroup Add-On (1994) 1 DOS

The Microsoft Workgroup Add-On for MS-DOS is the easy way to connect users of MS-DOS to networks based on Microsoft windows. Now you can share documents, messages, and printers among PCs running MS-DOS and connect to Windows-based PCs too. It could be just what you need to make the most of older PCs and start networking.

• 1.x