W3C Remote Logging to multiple syslog servers at once

Selectively choosing a Syslog server would be the easier option I believe. The HSL::open command takes a pool as its destination, so you'd necessarily have to create a separate pool (of one) for each Syslog server, and then switch between them accordingly. As for sending the data to all of the Syslog servers, that's not something the HSL process will natively do. You could create a separate connection for each and rapid fire log to all of them (sounds like a good idea for a proc), or perhaps send the data to a single Syslog instance that then replicates the data to the rest.