help !! shared lib's .. PEF executables..

- What are shared libraries? Are we going to use the same-shared libraries across all the versions? Otherwise is there any need for the so-called “Frame works”? If so, how can we implement it using Carbon?

- Hardware Interface – How can we overcome this two different architectural device driver problem? Is carbon providing any APIs to work across different OS versions?

- What are the changes needs to create a PEF executable that run on earlier as well new OS from Carbon point of view?