The Microsoft Windows 1.01 boot up screen. If you look at it sideways, that "O" in the center kind of looks like jaws with teeth.

When Windows 1.x starts, it launches the MS-DOS Executive. The MS-DOS executive is kind of like File Manager or Explorer, except there are no icons and no drag-and-drop. Programs and directories can be opened by double-clicking, but other disk functions must be done through the menu.

In Windows 1.x you are stuck with tiled windows. The control in the upper right corner of each window is a "resize" control. Dragging it around will move the top edge of the window and double-clicking will "zoom" the window to full screen. Some programs have a "resize" control in the lower right corner of the window as well.

The control in the upper left of the window is the system box. Clicking once on this box brings up a menu of available window options for the current window. In this version of Windows, it also contains the applications "About" information.