#include <GUIConstants.au3>

Global $name1 = "Сервер1", $name2 = "Сервер2", $list1, $list2, $server

$Form1_1 = GUICreate("Form1", 354, 572, 821, 257)
$Button1 = GUICtrlCreateButton("Button1", 24, 520, 129, 25)
$Combo1 = GUICtrlCreateCombo("", 16, 208, 153, 25, BitOR($CBS_DROPDOWN, $CBS_AUTOHSCROLL, $CBS_DROPDOWNLIST))
GUISetState(@SW_SHOW)
$Radio1 = GUICtrlCreateRadio($name1, 8, 24, 135, 16)
$Radio2 = GUICtrlCreateRadio($name2, 8, 55, 135, 16)

$arr = IniReadSection("data.ini", $name1)
For $i = 1 To $arr[0][0]
  $list1 &= "|" & $arr[$i][0]
Next
$arr = IniReadSection("data.ini", $name2)
For $i = 1 To $arr[0][0]
  $list2 &= "|" & $arr[$i][0]
Next

While 1
  Switch GUIGetMsg()
    Case $GUI_EVENT_CLOSE
      Exit
    Case $Button1
      Login(GUICtrlRead($Combo1))
    Case $Radio1
      GUICtrlSetData( $Combo1, $list1)
      $server = $name1
    Case $Radio2
      GUICtrlSetData($Combo1, $list2)
      $server = $name2
  EndSwitch
WEnd

Func Login($nick)
  Local $data = StringSplit(IniRead("data.ini", $server, $nick, ''), "|")
  If @error Then Return
  Local $user = $data[1], $pass = $data[2]
  MsgBox(0, "", "login:" & $user & @CRLF & "pass:" & $pass)
EndFunc


========
data.ini

[Сервер1]
nick1=p1|w1
nick2=p2|w2
nick3=p3|w3

[Сервер2]
nick2=p2|w2
nick3=p3|w3
nick4=p4|w4