DDETerminate Statement [Access 2003 VBA Language Reference]
You can use the DDETerminate statement to close a specified dynamic data exchange (DDE) channel.
For example, if you've opened a DDE channel to transfer data between Microsoft Excel and Microsoft Access, you can use the DDETerminate statement to close that channel once the transfer is complete.
The channum argument specifies the channel number to close. It refers to a channel opened by the DDEInitiate function. If the channum argument isn't an integer corresponding to an open channel, a run-time error occurs.
Once a channel is closed, any subsequent DDE functions or statements performed on that channel cause a run-time error.
The DDETerminate statement has no effect on active DDE link expressions in fields on forms or reports.