hrm I actually can only explain SVC_TEMPENTITY and SVC_WEAPONANIM. I guess you can use SVC_CDTRACK to tell the client that it should play a cd track but don't ask me how you could use it... Anyway, SVC_TEMPENTITY creates a temporary entity, that are mostly fx effects like explosions or sprites. You can find a list of all SVC_TEMPENTITY messages
here. SVC_WEAPONANIM tells the client to play a weapon animation but it often doesn't work with already-created weapons. Anyway, you can use the SVC_WEAPONANIM message in this way:
Code:
message_begin(MSG_ONE, SVC_WEAPONANIM, {0, 0, 0}, id)
write_byte(anim) // the weapon animation
write_byte(pev(id, pev_body)) // the body, you can use entity_get_int(id, EV_INT_body) instead if you don't want to use the fakemeta module..
message_end()