function server_event(str)
{
  if (event_type == event_join)
  {
    str_cpy(temp_str,str);
    str_cat(temp_str," has joined");
    scroll_message(temp_str);
    return;
  }
...
on_server = server_event;

Quote:

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on_server = function
The function is executed when the server receives a message from a client. The event_type variable is set to the type of the message. When the message contains a string, a pointer to the received string is handed over as parameter to the function.
Remarks:
There are 4 types of server events:
Event_join A client has joined the session. The client name is handed over.
Event_leave A client has left the session. The client name is handed over.
Event_string A client has sent a string to the server. The string pointer is handed over.
Event_var A client has sent a variable or an array to the server.

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