[Boost-users] A little confused about Boost static/dynamic libraries

Hi I am linking my MSVC-9.0 project to the Boost.Python library. The project is configured to use the 'Multi-threaded DLL' runtime library. When I link the project to Boost.Python, the linker evidently requires boost-python-vc90-mt-1_43.lib. But when I run the executable it loads boost-python-vc90-mt-1_43.dll. Sorry if this is a stupid question, but why does the linker require the .lib file, when the runtime uses a dll? Best regards David