+ | MsgDbPasswd of {dbtype : string, passwd : string}
+ (* Change a DBMS user's password *)
+ | MsgShutdown
+ (* Halt the server *)
+ | MsgYes
+ | MsgNo
+ (* Answers to boolean queries *)
+ | MsgQuery of query
+ (* Ask for host-specific information *)
+ | MsgSocket of socket_permission
+ (* Answer to a QSocket query *)
+ | MsgFirewall of string list
+ (* Answer to a QFirewall query *)
+ | MsgRegenerateTc
+ (* MsgRegenerate without actual publishing of configuration *)