A Better Mousetrap
A Better Mousetrap 1.0 is available as a free download on our software library. A Better Mousetrap relates to Desktop Tools. The following version: 1.0 is the most frequently downloaded one by the program users. This free software is an intellectual property of Fx Software. The program's installer file is generally known as abettermousetrap.exe.
From the developer:
A very simple application, choose the area you wish to trap the mouse in using the movable and resizable glass window, then press the hotkey combination to lock the pointer in the field. Once an area has been set, the application will retain that setting until either a new area is set, or the application is closed.
You may want to check out more software, such as MouseTrap, which might be similar to A Better Mousetrap.