window clicker

Minimizer is a prank program that will minimize the active window.

TweakWindow is a handy window enhancement utility with a wealth of options.

An application for displaing short messages on desktop in a window

Send entire screen or active window directly to printer

A small little program that allows Windows users to make any window transparent.

Change a window's transparency with a customizable keyboard shortcut.

Automatically activates a window or a control when the mouse hovers over it

Quickly close a window, a web page tab and so on.

View apps side-by-side, use virtual desktops, save your window sessions and more

This would help to avoid the "Error creating window handle" errors.