Thanks to all who contributed to this thread. Using sendMail.mc without self-configured SMTP preferences is, I fear, going to cause the potential users too much confusion. I therefore revert to Plan B and, as suggested, use a <mailto:> as the next best alternative. Plan is to:  store a generic myEmailWindow.htm as a userProperty  replace eMailVar on the fly in <A HREF" mailto:eMailVar">eMailVar</A>  put it into url(file:"&tPath)  use EXT.dll to launch file tPath  on quit, delete file tPath For elegance, the eMailWindow opens at a fixed size without distractions: <A HREF="" onClick='msgWindow=window.open ("myEmailWindow.htm","displayWindow","toolbar=no,location=no,directories=no, status=no,menubar=no,scrollbars=yes,resizable=no,width=245,height=175"); return false'> Click here to send an eMail</A> So a simple question... How do we include window display parameters in the myEmailWindow.htm and thus avoid requiring a host window to launch it from? Is it possible? /H Hugh Senior The Flexible Learning Company Consultant Programming & Software Solutions Fax/Voice: +44 (0)1483.27 87 27 Email: [EMAIL PROTECTED] Web: www.flexibleLearning.com Archives: http://www.mail-archive.com/metacard%40lists.best.com/ Info: http://www.xworlds.com/metacard/mailinglist.htm Please send bug reports to <[EMAIL PROTECTED]>, not this list.