HI I have a possible client (my first one) that is very keen to secure the program I develop against illegal replication. I haven't found anything in metacard that helps me with this. Is there a computer id or something that can be accessed fom within metacard? What do other people do? Thanks to everyone who helped me with the ellipse thing. I have now found the equation for a superellipse and it suits my purposes perfectly. I can now find the coordinates of ellipses with different shaped curves. Also thanks to Xavier for the very simple method to determine whether the mouse is inside or outside the points of a polygon. Regards Monte Goulding _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.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.