User`s guide

Introduction to PCIS-DDE • 1
1
Introduction to PCIS-DDE
PCIS-DDE is an application for Windows NT operating systems. It acts as a
DDE (Dynamic Data Exchange) Server and allows other Windows
application programs to access data from NuDAQ PCI-bus data acquisition
cards. It may be used with Wonderware InTouch and any Microsoft
Windows program that is capable of acting as a DDE Client.
1.1 What is DDE?
DDE (Dynamic Data Exchange) is a communication protocol designed by
Microsoft to allow concurrently running programs in the Windows
environment to exchange data and instructions with each other. It
implements a client-server relationship between the applications. The
server application provides the data and accepts requests from any other
application interested in the data. The requesting applications are called
clients which can both read and write data maintained by the server. Some
applications such as InTouch and Microsoft Excel can simultaneously be
both a client and a server.