[Roko_foko]

pawn Код:

public OnPlayerConnect(playerid)
{
    new Name[MAX_PLAYER_NAME+1],str[128];
    GetPlayerName(playerid,Name,MAX_PLAYER_NAME);
    if(strfind(Name,"[FxF]")!=-1){
        format(str,126,"Player with %d has [FxF] tag in their name.",playerid); 
        for(new i=0;i<MAX_PLAYERS;i++)if(IsPlayerAdmin(i))SendClientMessage(playerid,0xFF0000FF,str);
    }
//rest of code
}

This will show all admins ( rcon ) message when someone enters the server and has tag. With them, later, you can do as you wish.