The Impact tab on the Story Card is a quick view of all the items that have an impact on that story, including other stories, defects, and code that has been checked in.
From this tab you can see:
When there is no content for a section, the section will be hidden. You can also collapse and expand sections by clicking on the section heading.
Each item description will include the date the item was modified and the name of the last person to modify the item. The location column will indicate where the item is located which is a link to the item. Items in StarTeam will open StarTeam to that item in the tree. Items located on the internet will open a new browser window to that item.