WIth NCover, you can collect code coverage across multiple machines, multiple users and multiple executions. Aggregating all of this data is part of what makes NCover so effective in improving overall .NET code quality. It can also create a lot of data. By merging and consolidating your coverage results, you can easily create a focused view of your test coverage results.
By using Merge and Consolidate within NCover Desktop or NCover Code Central, you can create a single report containing coverage information gathered from multiple test machines. These options are useful when managing large projects with multiple tests where you want to get a more complete, unified picture of your test coverage results.
Find more on merging and consolidating code coverage results at http://www.ncover.com/support/docs/v4/feature-reference/desktop/merge or http://blog.ncover.com/merge-coverage-for-rebuilt-assemblies/ or http://blog.ncover.com/4-3-scalability-and-performance/.