This package is not yet documented.  See the inline comments in ddesamp.c
for a description on how to establish a DDE session with EPM.
See the macro post.e for a description of how to write E macros which
return information to the client that EPM communicates with.
The current DDE support only allows EPM to be the server in a DDE
conversation.  It is planned that future support will allow EPM to initiate
a DDE conversation through macros and act as a DDE Client, however no
commitment to do so should be implied.
