Catching XML data size limit

I am using the following code to catch XML posted back to the server:

Set xmlDOM = createobject("Microsoft.XMLDOM")

xmlDOM.async = False

xmlDOM.loadXML strReq

If (xmlDOM.parseError.errorCode <> 0) Then

	Set myErr = xmlDOM.parseError

	Call alog.LogAction("MSXML parse error: " & myErr.reason)

	Goto Finished

End If

strXML=xmlDOM.xml

My question is: Is there a size limit on the data which can be posted??

TIA,

Mark.