A server object.
A topic object.
The generic function
dde-server-poke is called in response to a poke transaction. A method specializing on the classes of server and topic should poke the data given by data into the item specified by item.
The set of supported formats may be extended in future releases, so applications should always check the value of the format parameter and reject transactions which use formats not supported by the application.
LispWorks User Guide and Reference Manual - 20 Sep 2017