This page uses a non-strict doctype, which should turn off borders in KioWare (tm):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
As documented by Microsoft, this forces the browser control into
non-standards compliance mode.
Additionally, one of clients noticed that they had to use
<BODY style="border:0;">
in addition to the doctype, in order to achieve the desired effect.