Would be very easy, using GET.
Let's say you wanted to input my taxes. My name is "Michael", and next years return is "$800". Keeping it simple, this would be the insert script to work with:
// sql
(mysql connections here)
// get vars
$name = $_GET['name'];
$return = $_GET['return'];
// insert
mysql_query("INSERT INTO taxes(name, return) VALUES('$name', '$return');
I have forgot most of my VB6 knowledge, so mind my incorrect coding:
Private Sub click_button(SEND TAXES)
name = txtNAME
return = txtRETURN
Inet1.Execute("http://site.com/script.php?name=" &name& "&return=" &return")
Something like that. You get it.