You are right. That was it. Thank you! I made a complete new installation within dosbox, and now it works, although I installed always the same drivers as before. All these modifications, with setup inside or outside of win3.11, of the already installed version didn't help. Strange thing.

Initially I had installed the logitech driver for the mouse and the normal VGA from win. No TSENG-drivers at all. Change of the mouse driver to Microsoft (and back, as described) and change of the VGA to Super-VGA (and back, as described) has no effect regarding the functionality of the mouse. …

Thank you, but this link does not help. Its only an advice to install win3.11, short mentioning a not visible pointer. But my win3.11 IS installed and works, with the exception of the mouse, and my mouse-pointer IS visible, but works not. So - has someone another trick?

Hello, I use the dosbox within winxp. I can start the mouse within the box for normal dos-applications, and it works well. I even can start win3.11 within the box, it works also. But within win3.11 the mouse doesn't work, always. I can see and move the pointer, but the clicks have no effect at all. …