The AEMO has provided this page on the Reliability and Emergency Reserve Trader (RERT), which will be of some use.
(A) History of the RERT
When time permits, will come back here to fill in some details.
(B) Coverage of Reserve Trader on WattClarity
Articles on WattClarity that have been tagged with ‘Reserve Trader’ are here.
You might find other (i.e. untagged) articles by searching the site via Google for ‘RERT’ or ‘Reserve Trader’ as keywords
(C) Other external information about Reserve Trader
The AEMO has put together this useful Factsheet on the Reliability and Emergency Reserve Trader (RERT).