Try this:

oShell = CreateObject("WScript.Shell")
IF oShell.AppActivate("Login")
    ?"OK"
    oShell.SendKeys("hello{TAB}password{ENTER}")
endif

>I'm trying to use IE automation to login and transmit data to a web site (a Web Service is currently not available). My problem is that the initial page opens a popup window for logging in, but I can't get a reference to the popup. It doesn't show up in the IE.Document.Forms collection. Does anyone know how to do this? Once I have the reference, I think I can proceed. Here's what my code looks like:
>

>oIE = CreateObject("InternetExplorer.Application")
>oIE.Visible = .t.
>oIE.Navigate("https://goldleafach.com/achbeta/?8435017")
>? oIE.Document.Forms.Length  && returns 1 (initial form only)
>? oIE.Document.Forms(0).Name && returns name of initial form
>? oIE.Document.Forms(1).Name && fails
>