Demo of infobox
[form myform][section half]
[row "Enter Box message:"][input boxmsg$ size=100%/10 event=testinfo@event]
(The above input is called boxmsg$)[/row]
Below is the infobox defined as \[show mybox$ class=infobox\]
[show mybox$ class=infobox]
The logic to update the message was:
%webster'update("mybox$",boxmsg$)
[/section][/form]