The server's sound list and particle effect list as FTE gives them to a player's client: the first time a player is sent them, the whole sound list as svcfte_soundlistshort and each effect as svcfte_precache, as FTE's signon does; after that every sound or effect added since, as svcfte_precache, as FTE sends a precache made while the level runs. All go into the player's reliable messages (QuakeServer.Outbox).

server = QuakeServer.Precaches.send(server, 1)

The sound list is the server's sound_names, index 0 the empty name; the effects are the host's ext.effects (%{name => number}, numbered from 1). What each player has been sent is kept in the host's ext.precaches_sent.

The messages are <<56, 0::little-16, name, 0, name, 0, ..., 0, 0>> (the names from index 1, an empty name, then 0 for no more) and <<77, code::little-16, name, 0>>, code the index with bit 0x8000 set for a sound or bit 0x4000 for an effect.