OLE (object linking and embedding) creates data links between applications, making it possible to work on a single file, whilst automatically updating information held on other files. For example, when working on a financial spreadsheet, one can automatically update the figures in a word processed report and an electronic mail message, without having to open them up. This volume introduces the basics of OLE under Windows 3.1 and describes how to implement it. The book includes a comprehensive reference to OLE interfaces and the OLE API (application programmer interface). It is particularly for use with version 2.01 of OLE.