Try addressing someone directly by putting their complete user name into your question. This might get their attention faster. You should also consider posting a message to OpenMRS Talk.
Command to type
What it does
Sets your current nickname to YourName
Sends message to NickName in a private chat window
Sends text in a 3rd-person sort of way, e.g., "YourNickName starts to dance"
Shows you additional information about NickName
Logs out of IRC