The Geocoding class here does not implement all the verbs, but it gives you the basis of a COM-based approach, assuming, re speaking of Windows clients.
OP Edit (Example):
Dim httpObject As Variant Dim httpURL As String Dim response As String Dim returnCode As String Set httpObject = CreateObject("MSXML2.ServerXMLHTTP") ' use MSXML object httpURL = "http://" & yourWebServiceURL Call httpObject.open("GET", httpURL, False) response = Left$(httpObject.responseText,16000) returncode = GetGeoValue("code") ' eg 200 for success
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