We have a huge PowerBuilder application currently running PB 11.5.1 deployed
as win32 native code (P-code) because we use DDE as the integrating
technology between our product and a whole range of different GIS

We want to move into .NET and WPF/WCF for greater user experiences and
easier WS* and RESTful integrations but we still have the significant GIS
integrations using DDE. The pain point is that GIS is expensive so many
customers will continue to use their existing GIS win32 applications for the
time being. So we need a solution for two-way interfacing between PB WPF and
GIS win32.

Any suggestions on what technology we should choose to replace DDE in our
Ideas greatly appreciated! Even the tricky ideas like COM Callable Wrappers

Michael Kramer, Denmark.