static object prolog()
{
var thread = O.paren("c" + Thread.CurrentThread.ManagedThreadId);
var reallyNow = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
var frozenNow = Dates.nowFrozen() ? O.paren(O.ymdHuman(O.now())) : "";
return(thread + " " + reallyNow + frozenNow + ": ");
}