Sorry to jump in here, just want to throw in my 2 euros...

In your original post, you've got it right about the interface business. That's exactly what you want to do. Your plug in server and your plug in clients will share this interface - it's the contract.

Don't believe you answered Edneesis' first question about "Did you find the previous plugin posts on this forum?" That will help.

i have no understanding of C#
Yes you do You know .NET and it's only code, anyway. You can figure it out if you spend a little time.

Examples are out there, it's up to you to learn it rather than being told what to do.

Mike