I want to sendmessage from unity to my c# program but failed

Hi I have done a small test that I put unity player into a program which using c#. I can do control from c# into unity player, and move object in sence. but I want to ask that, can I send a message from inside 3D sence to program when I click the button?

yes, I have a same question about it! I know unity can take communication with web,use
GameObject.SendMessage (in)
Application.ExternalCall() (out)

I can SendMessage from c sharp to unity , but I can’t Send out any Message to c sharp…:cry:

waiting for help and good ideas!

anyone can answer me? thankyou

:cry:

stop at load data error!!