HTTP POST via Hyperlink.Follow

HTTP POST via Hyperlink.Follow in VBA code -- how is this done? The help says that a parameter called ExtraInfo is used to "specify additional information" such as "the contents of a form". But nothing I try gets any data through to the ASP on the server -- in VBscript variable evaluations, Request.Form comes up empty and Request.Form.Count is zero.

HTTP SUBMIT _does_ in fact work, using ExtraInfo to pass the data. But that has all the usual SUBMIT problems, and POST would be preferred.

So what am I missing?