X Window Information
displays information about X windows under the mouse cursor
This is a window information utility for developers of applications,
toolkits, and window managers. wininfo follows your pointer providing
information about the windows below.
Information presented includes:
- A detailed description of the window hierarchy below the pointer.
- Parsed interpretations of standard properties from both the
application window and the window manager.
- Information about X server resources used by the application.
wininfo requires an X server supporting the X-Resource
extension. The XFree86 server provided by Debian enables this
resource by default.
Homepage: http://www.freedesktop.org/Software/wininfo