title: Merge a source branch to a target branch is both ways or only one way
body: <p>When I merge a source branch 'Branch1' to a target branch 'IntegrationBranch', <strong>then changes are only done to 'IntegrationBranch'</strong> as a result ( i.e. one-way operation) <strong>OR even 'Branch1' may get changed</strong> in this merge operation (two-way operation)?</p>
  
  <p>I am using TFS 2010.</p>