Different compression programs result in different
compression ratios and compress different types of files
unequally.
Archmerge will take the best files from each archive and
create a new output file, which is guaranteed to be equal
to, or smaller in size than both of the input files. Archmerge
can also be used to perform boolean operations on archives,
such as merging 2 archives together, or updating a new file.

NOTE: in it's current incarnation. Archmerge only operates on
zip archives. Additional compression algorithms and techniques
will be added soon.