It is possible to show the list of connected players.
-Display a list of player in the chatlog
-Display a list of button with the playernames.
The examplecode below will be executed when typing the !lop command. Event OnMSO ($userName, $text ) # Player event 
<?php 
#Display list of players in the chatlog
CASE "!lop":
    $LoP = GetListOfPlayers("U");
    privmsg("-----[List of connected players]-----");
    FOREACH ($Player IN $LoP)
        $PLYuserName = $Player["value"];
        privmsg(GetPlayerVar($PLYuserName,"NickName")." ^8(".$PLYuserName.")");                        
    ENDFOREACH
BREAK;
#Create a list of buttons with the playernames.
CASE "!lop":
    $hgt = 80;
    $LoP = getListOfPlayers("U");
    privmsg("-----[List of buttons with connected players]-----");
    FOREACH($Player IN $LoP)
        $PLYuserName = $Player["value"];
        openButton($userName,"Btn_".$PLYuserName,170,$hgt,30,4,1,-1,16+64,GetPlayerVar($PLYuserName,"NickName")." ^8(".$PLYuserName.")");
        $hgt=$hgt+4;
    ENDFOREACH
BREAK;
?>
If it not possible to prevent displaying messages (chatlog) from players.