Update a text box RAPIDLY! ??

Hello,

I will have a webpage that contains an RPM textbox. This textbox has to show the RPM's of spinning part on a machine. How would I update this textbox this fast and without disrupting the rest of the page?

Thanks for any ideas..and examples..

does the normal way disrupt the rest of the page?

try flash, that might do it.

You're using a web-based solution to monitor RPMs???? You gotta be kidding me.