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4GL Statements For DDE Conversations

Progress provides several 4GL statements to open and manage DDE conversations. Table 6–1 lists these DDE statements.

Table 6–1: DDE Statements 
Statement
Description
DDE ADVISE
Creates or removes a link to a DDE server data item. Creating a link allows Progress to trigger a DDE-NOTIFY event when the data item changes value.
DDE EXECUTE
Sends one or more application commands to the DDE server to execute.
DDE GET
Retrieves the new value of a linked data item in response to a DDE-NOTIFY event for the data item. You typically invoke this command in a DDE frame trigger block for the DDE-NOTIFY event.
DDE INITIATE
Opens a DDE conversation.
DDE REQUEST
Requests the current value of a server data item.
DDE SEND
Sends a new value to a server data item.
DDE TERMINATE
Closes a DDE conversation.

The following sections provide more information on how Progress structures DDE conversations and how to use these 4GL statements to open, manage, and close DDE conversations. For a complete description of each statement, see the Progress Language Reference .


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