TFS: how to associate a bug to an iteration and how to associate a check-in with a bug or task

When viewing a bug in Team Foundation Server, at the same Details pane where one may log hours there is an Iteration drop down where one may associate the bug with a particular iteration. When performing a check-in you will notice four icons for Source Files, Work Items, Check-in Notes, and Policy Warnings at the left of the dialog box that manages the check-in. Click on Work Items to associate the check-in with a task or bug. The query drop down that will appear at the top of the dialog box will allow you to select different categorizations of tasks and bugs to browse from.