Very real-time, as in Unix with real-time kernel extensions. Direct dedicated line to the exchange floor, processing trading info to recalculate portfolio positions and extrapolate potential future movements. Traders used this info on one screen and then input their trades on their dedicated terminals.
Very cool! Is there any metrics you could share at a high level? e.g. what latency (sw/hw)? throughput? what type of protocols/connections was used? what level of concurrency/parallelism? anything else? Cheers