Общие вопросы

> Ну и? Как его сформировать?

Поищи в MSDN. То, что мне первым попалось(sorry, на VBScript):

Dim strXML As String
Dim strURL As String
Dim objHTTPRequest As New MSXML.XMLHTTPRequest
Dim objXMLDocument As New MSXML.DOMDocument

strXML = "<TESTDOC>A Test XML Document</TESTDOC>"
objXMLDocument.loadXML strXML
objHTTPRequest.open "POST", "http://test.microsoft.com/xmltest.asp", False

objHTTPRequest.setRequestHeader "Cookie", "cookietest=testvalue"
' Must repeat call to get cookie set
objHTTPRequest.setRequestHeader "Cookie", "cookietest=testvalue"

objHTTPRequest.send objXMLDocument

MsgBox objHTTPRequest.responseText

Set objXMLDocument = Nothing
Set objHTTPRequest = Nothing