Twm
twm (Tab Window Manager) is a window manager for the X Window System. Started in 1987 by Tom LaStrange, it has been the standard window manager for the X Window System since version X11R4. The name originally stood for Tom's Window Manager, but the software was renamed Tab Window Manager by the X Consortium when they adopted it in 1989. twm is a stacking window manager that provides title bars, shaped windows and icon management. It is highly configurable and extensible. twm was a breakthrough achievement in the early years, but has been largely superseded by other window managers, which unlike twm, use a widget toolkit rather than writing directly against Xlib. Various other window managers—such as vtwm, tvtwm, CTWM, and FVWM—were built on twm's source code. twm is still standard with X.Org Server, and is available as part of many X Window System implementations. Usage twm's interface is different from modern common X window managers and desktop environments many of which tend to work similarly to the Apple Macintosh or Microsoft Windows. New users often find twm difficult without reading the manual page. In the default configuration of twm, the title bar has two buttons: Resize button (nested squares): the user clicks here, drags the mouse pointer to the edge to be moved, then releases when the window is the desired size. Iconify button (circle): reduces the window to an icon. There is no title bar button to close a window. A left click on the desktop brings up a menu, which includes an option to delete (close) a window. Window close functionality for the titlebar can be configured in the .twmrc file: See . A left click on the title bar brings the window to the top of the window stack; a middle click moves the window; a right click sends the window to the bottom of the window stack. Window focus follows the mouse pointer (point-to-focus), rather than being on whichever window was clicked last (click-to-focus). When a new window is created, a 3×3 grid is displayed following the mouse pointer, waiting for the user to click where the window should appear — left-click to appear in that position with that size, middle-click to resize the window before its creation, right-click to appear at that position but long enough vertically to reach the bottom of the screen. Note that any of the above may be changed with appropriate changes to the configuration file. (The system file is typically and the user file is typically .) History twm was written as a replacement for the uwm by Tom LaStrange while he was working at Evans & Sutherland, which was part of the X Consortium: "I sat down at my monochrome Sun 3/50 and typed vi twm.c and then opened the X11 documentation. twm was my first X program. About six months later, I convinced my manager to let me send a copy to the comp.windows.x newsgroup for testing." A version for X11R1 was published on the Usenet newsgroup