Find YouTube channels that are available, example for AutoHotkey ActiveX controls

FindFreeChannels.ahk

Gui Add, Edit, w600 r1 vURL, aboutscript
Gui Add, Button, x+6 yp w44 Default, Go
Gui Add, ActiveX, xm w600 h540 vWB, Shell.Explorer
ComObjConnect(WB, WB_events)  ; Connect WB's events to the WB_events class object.
Gui, Add, Edit, ys vOutput w200 h540
Gui Show

; Continue on to load the initial page:
ButtonGo:
Gui Submit, NoHide
WB.Navigate("youtube.com/user/" URL)
return

class WB_events
{
    DocumentComplete(wbo, NewURL)
    {
		global
		Gui, Submit, NoHide
	
		html := wb.document.body.innerHTML
		if InStr(html, "/error?src=404&ifr=1&error=""") 
			and not InStr(output, url "`n")
			Output .= URL "`n"
        GuiControl,, Output, %Output%  ; Update the URL edit control.
    }
}

GuiClose:
ExitApp