side-by-side display of two files with latex

["Russell L. Harris" <rlharris@oplink.net>]

I need to typeset a document in which a pair of files are displayed 
side-by-side, each in its own column, so that the reader easily may 
compare the two files.

The problem is that each file spans several pages; so the left column of 
each page must be a continuation of the left column of the previous 
page, and the right column of each page must be a continuation of the 
right column of the previous page.

Can this be done in LaTeX? perhaps with the minipage environment?

RLH