* Notify the listeners that this {@link Progress} changed value.
*
* @param pg
- * the emmiter
+ * the emmiter, that is, the (sub-){link Progress} that just
+ * reported some change, not always the same as <tt>this</tt>
* @param name
* the current name (if it is NULL, the first non-null name in
* the hierarchy will overwrite it) of the {@link Progress} who