Displaying & caching PDF files

[jbv at souslelogo.com]

Hello list,

I have a request from a client for a mobile app that would display pdf 
files.
I know I can use a browser object to display those files, I've done that
numerous times.
My question is more about caching the files, and displaying them again
later without having to download them each time.
I assume that the files are stored in the default browser cache of the
mobile device, but if the same file is being displayed again, does the
browser object look up the default browser cache, or do I have to
implement some sort of cache function in the LC app itself ?

Thanks in advance.
jbv