Thank you very much! The input was my next question. I found help here:
http://script.quakenet.org/wiki/How_do_I_customize_mIRC%27s_own_output
code by itself:
on *:input:#:{
if (!$ctrlenter) && ($left($1,1) !== $readini(mirc.ini,text,commandchar)) {
echo -lmt $chan ( $+ $replace($nick($chan,$me).pnick,@+,@) $+ ) $1-
.msg $chan $1-
halt
}
}