DDEPoke writes a data value to the Cascade DataHub. For example, to send a value from an Excel spreadsheet to the DataHub, the DDEPoke command is run from within an Excel macro. For more details, please refer to Section 4.2.2, “Method 2 - Writing Excel macros that use the DDEPoke command”.

DDERequest reads a data value from the Cascade DataHub. To get that value into Excel, for example, the DDERequest command is run from within an Excel macro. For more details, please refer to Section 4.1.2, “Method 2 - Excel Macros using DDERequest”.

DDEAdvise creates a connection, called an advise loop, that updates a new data value automatically. The advise loop is a unidirectional link, established by a client program that wants to receive data from a server program. The client continues to receive new point values as long as the two programs are running, or until the advise loop is terminated.

You can use DDEAdvise to read data from the Cascade DataHub by configuring the DataHub to act as a DDE Server. For an example using Excel, please refer to Section 4.1.1, “Method 1 - Drag and Drop using DDEAdvise”.

Likewise, you can use DDEAdvise to write data to the Cascade DataHub, by configuring it to act as a DDE Client. For an example using Excel, please refer to Section 4.2.1, “Method 1 - Configuring DDEAdvise loops in the Cascade DataHub”.