The tool window is marked with the icon 
Use this tool window to add Ant build scripts to your project, control behavior of the build, and run build targets.
IntelliJ IDEA implements the Ant Build tool window functionality with a bundled plugin, which can be completely disabled by clearing the Ant support check box on the the page of IntelliJ IDEA preferences (Ctrl+Alt+S) .
Ant Build
| Item | Description |
|---|---|
 | Click this button to add an Ant build file to the current project. |
 | Click this button to remove the reference to the selected build file from the current project. |
 | Click this button to run the selected build target. |
 | When this button is pressed, only the primary targets are visible. |
  | Use these buttons to expand or collapse all the nodes. |
 | Click this button to show the properties of the selected Ant build file. |
 | Click this button to show the corresponding reference topic. |
Ant build results
Results of running Ant targets or the entire builds are shown in the Messages tool window.