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On my iMac, I keep a lot of supervision windows (displaying alarms and trends). These windows lead to priviledged access to very sensitive equipments. I would like to protect this iMac from any accidental typing on the keyboard or mouse mouve, and password protect it from any other local access.

I would like to be able to start my screen saver (which will lock my mouse and keyboard by asking my password), but to keep a full acces to the actual display.

Is there any way to make a transparent locked screen?

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2 Answers 2

While I did not install any, there seem to be some "transparent" screensavers available for download. A transparent screensaver would accomplish what you are trying to do.

Have a look at, and try:

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My tests on Mountain Lion failed. Thank you for your attempt to help :). –  daniel Azuelos May 10 '13 at 8:51
up vote 0 down vote accepted

The JohnnyNash Transparent screensaver works (weeks of testing in production environment) correctly on:

  • Lion
  • Mountain Lion

The internal description of its functioning does exhibit a pretty good level of transparency. Read full and simple documentation here: JohnnyNash - Screen Saver

To install it, just open the disk image, and johnnynash.saver.

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