Variable size (limitations)?

Does anyone know the limitations for the passing of an HTML variable to and
from an RPG program using CGIBIN2 and/or Bob Cozzi's RPG xTools?  I'm trying
to create a task management tool where I can create tasks for my staff,
publish specifications, developer notes, etc and I need to know how just how
big I can make a text box to support each "note" type.

 

Also, is there a way to browse to Windows to "attach" scanned documents?
Ideally what I'd probably want to do is do a browse, open up a Windows
dialog box to search for a file ,then when selected copy it to the IFS where
I could then reference it later from a web page via my CGI programs.