This example is from HP's document KM203955. It seems to work pretty well. You'll have to modify it a little for your specific use.

Set oDesc = Description.Create()
oDesc(''micclass'').Value = ''Browser''
Set oBrowsers = Desktop.ChildObjects (oDesc)
flag = 0
For i=0 To oBrowsers.Count - 1
title = oBrowsers.Item(i).GetROProperty(''title'')
msgbox title
' check if the browser with title ''Yahoo - Microsoft Internet Explorer''
If Left(title, 5) = ''Yahoo'' Then
flag = 1
Exit For
End If
Next
If flag = 0 Then
msgbox ''Can't find browser Yahoo - Microsoft Internet Explorer''
End If