in mIRC the condition if return 1 is $true if return 0 or $null is $false
like that e.g
alias t {
var %t $1
if (%t) echo -a true
else echo -a false
}
look for the result
/t 1 return true
/t 0 return false
/t return false
so if $readini(wmsg.ini, $nick, wmsg) if return 1 command will be execute if return 0 or $null will not execute