Could you clarify which software or hardware product you are interested in? RAR-EC - Abaco Systems

"RAR" is a product line for Abaco Systems , featuring avionics databus interfaces like the RAR-cPCI or RAR-EC , which support ARINC protocols.

It might simply be a request for a RAR archive file containing a specific "feature," though without a product name, this is less likely.

It could refer to a specific node or file path on a corporate website, such as a BioCryst Pharmaceuticals SEC filing hosted at node ID 23706.