Finally I was able to attach to runing Chrome instances. Here is example script: #include "wd_helper.au3" #include "wd_capabilities.au3" # HOW TO TEST: ; At first run choose [Yes] to create new session Chrome running instance ; At second run choose [No] to attach to active Chrome running instance Global $_MY__WD_SESSION Global $__g_sDownloadDir = "" _Test() Exit Func _Test() Local $iAnswer = MsgBox($MB