Media Object integration with third party

I'm wanting to use the provided functionality in JDE to integrate to a third party imaging system. I see app P98101, form W98101A is available to setup a custom DLL call from within JDE. Has anyone done this? I'm looking for info on the parameters for the DLL that we will build. I'm working with my third party provider on this issue.

Please, look at our One Attachment Manager software solution - it offers 3 different sets of API's for MO manipulation...