[cdt-dev] Eclipse CDT projects - clarification please?

["g4@xxxxxxxxxxx" <g4@xxxxxxxxxxx>]

Background: Wish to automate the conversion Visual Studio C++ projects 
to Eclipse equivalents.

Problem: The VS projects have complex structures with source files that 
are unique to some projects and/or configurations.

Questions:

1. Am I right in thinking that a standard Eclipse CDT project does not 
contain a single explicit listing of contents?
2. Eclipse considers a project to be all the files that are accessible 
from an arbitrary root folder?
3. There is no way to tell Eclipse to ignore a file for a given project?

Research so far limited to:

http://wiki.eclipse.org/CDT:Flexible_Project_Structure
http://wiki.eclipse.org/CDT/User/FAQ#How_do_I_create_a_new_project_using_a_directory_full_of_existing_source.3F