How to read from Serial port in a webpage

Question

I want to design a webform that user should fill some fields. The value of one field should be read from Serial port (COM1) of client computer which a special hardware is co

Answer 1

This would appear to break most security models for the web. I cannot think of a way that it would be possible to do within a browser without granting an applet or ActiveX control a whole lot of permissions (and even then I'm not certain it's possible). I think it's likely to require some kind of native "thick" client-side application to do the communication with the serial port.