Service Names, Topic Names, and Item Names
A DDE server uses a three-level hierarchy
service name (called "application name" in previous DDE documentation), topic
name, and item name
to uniquely identify a unit of data the server can exchange during a
conversation.
A
service name is a string a server application responds to when a client attempts to
establish a conversation with the server. A client must specify this service name to
establish a conversation with the server. Although a server can respond to many
service names, most servers respond to only one name.
A
topic name is a string that identifies a logical data context. For servers that operate
on file-based documents, topic names are typically filenames; for other
servers, they are other application-specific strings. A client must specify a topic
name along with a server's service name when it attempts to establish a
conversation with a server.
An
item name is a string that identifies a unit of data a server can pass to a client
during a transaction. For example, an item name might identify an integer, a
string, several paragraphs of text, or a bitmap.
The service, topic, and item names enable the client to establish a
conversation with a server and to receive data from the server.
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