Dear Dr. Jeffery, Here's my second attempt at Homework #4. The chat window pops up, but the actual room seems to freeze on my computer. If you run unicron.exe the chat window is there. I've tried to send a couple of messages, and received them on the console window. When I opened up unicron.exe twice, I did not receive the chat message on the other side. I was wondering if user.icn also needs to be linked in unicron.icn, so I did that. If I try and run worlds.icn, it give me a runtime error 117. I've attached my assignment as gustavunicron.zip. Do you have any suggestions? thanks for your patience, see you in class, Gustav