i noticed that some mIRC replies cannot be halted. suck as:
* Attempting to rejoin channel #channel
* Disconnected
* Connecting to server on port
... but how do scripts which are using using MTS theme engine change it ? how does it work ?

use /haltdef on these events (beginning with a ^): ACTION, BAN, CHAT, DEHELP, DEOP, DEVOICE, HELP, INVITE, JOIN, KICK, MODE, NICK, NOTICE, OP, OPEN, PART, PING, TEXT, UNBAN, USERMODE, VOICE, QUIT, SERV, SERVERMODE, SNOTICE, TOPIC, WALLOPS and replace them with your customized text.

For ex:
on ^*:JOIN:#:echo $chan $nick has joined $chan | haltdef

i was asking about these events which cannot be haltdefed:
* Attempting to rejoin channel #channel
* Disconnected
* Connecting to server on port
..