Hi, Ge!
In short, chout prints to stdout (buffered output, higher performance), and cherr prints to stderr (more timely and synchronous, handled differently by console/pipes/redirect). The existing <<< >>> operators prints to stderr by default (there was actually no way to print to stdout before chout).
If one desires truly synchronous output, then cherr is probably the way to go. At the same time, there are a few nuances of cout (C++) - there is a method to force flushing the buffer - this actually exists for chout - just invoke .flush(). Inserting an "endl" into C++ cout effectively flushes the output stream - this is currently not implemented. I've made
this addition in CVS (IO.newline() or "\n" by itself will cause a flush on chout), and this should be in the next release.