How does a Broker-Dealer lend shares to other Broker-Dealers?

External question — Quantitative Finance Stack Exchange Author: Peter Arnolds Original post: https://quant.stackexchange.com/questions/23018 License: CC BY-SA 3.0 — https://creativecommons.org/licenses/by-sa/3.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Is it possible to find out how a OTC Broker-Dealer in thinly-traded equities lends shares for short-sales to other Broker-Dealers. Which platform or process is involved?