Current Tab
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at Current Tab.
By clicking the Current tab, you can see a call stack (if available) that is closest to the current selection point in the timeline if a CPU thread segment is selected. In this case, the selection point is represented by a black arrow, or caret, above the timeline. When a blocking segment is selected, the caret is not displayed because there was no execution. However, the segment is still highlighted and a call stack is displayed.
The Current tab also displays information about DirectX activity segments, markers, and I/O access. For DirectX activity segments, information about the way DMA packets are processed by the hardware queue is displayed. For markers, information about the description and marker type is displayed. For I/O access, information about the file and number of bytes read or written is displayed.