I must be dreaming...
Deos anyone know where MTS_MON tables are coming from?
for example:

CREATE TABLE MTS_MON$ATTACHMENTS (
MTS_VERSION_ID BIGINT NOT NULL,
MON$ATTACHMENT_ID INTEGER NOT NULL,
MON$SERVER_PID INTEGER,
MON$STATE SMALLINT,
MON$ATTACHMENT_NAME VARCHAR(253),
MON$USER CHAR(31) CHARACTER SET UNICODE_FSS,
MON$ROLE CHAR(31) CHARACTER SET UNICODE_FSS,
MON$REMOTE_PROTOCOL VARCHAR(8) CHARACTER SET ASCII,
MON$REMOTE_ADDRESS VARCHAR(253) CHARACTER SET ASCII,
MON$REMOTE_PID INTEGER,
MON$CHARACTER_SET_ID SMALLINT,
MON$TIMESTAMP TIMESTAMP,
MON$GARBAGE_COLLECTION SMALLINT,
MON$REMOTE_PROCESS VARCHAR(253),
MON$STAT_ID INTEGER
);

described as
'Versioned MON$ATTACHMENTS records.';

Whats' triggering their creation

 regards
 Alan McDonald