Michel The HeaderHandler is not a property buit a method of SOAP client object. Did you try?

loUniversalThread.HeaderHandler(CreateObject("SessionInfoClient.ClientHeaderHandler"))

>HeaderHandler is a member not found to the SOAP client directly. It has to be assigned such as the SET command in VB. The problem is that in VFP, that doesn't seem to be as simple. We first need to connect a property HeaderHandler to the SOAP client.