# Split screen stereomode in windows 10 **URL:** \ **Category:** Bugs & Features\ **Tags:** windows\ **Created:** [February 15, 2021, 3:47pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667 "2021-02-15T15:47:54Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Cher](https://avatars.discourse-cdn.com/v4/letter/c/7cd45c/32.png) [@Cher](https://psychtoolbox.discourse.group/u/Cher)\ **Post date:** [February 15, 2021, 3:47pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667/1 "2021-02-15T15:47:54Z")
Hi! I’m new to PTB in Windows. In Macs, stereomode=4 splits a single display into two halves for the L and R images. Is there a way to do so in Windows? It seems like stereomode=4 in Windows is equivalent to stereomode=10 in Macs, but stereomode=10 in Windows somehow presents only presents a monocular image instead of splitting the screen. On my machine, only the left image is presented (i.e.,SelectStereoDrawBuffer=0). Any ideas anyone? Thanks! ---
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [February 15, 2021, 8:22pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667/2 "2021-02-15T20:22:05Z")
Stereomode 4 does exactly the same thing on Windows as on macOS, split the onscreen window in two halves? At least on a single-display setup. For dual-display stereo setups, you’d need to choose screenId 0 or a stereo-compatible configuration for a window to span the two displays. You need to provide more details. And you’d need to buy priority support if you’d need further timely responses from myself. -mario ---
**Author:** ![Cher](https://avatars.discourse-cdn.com/v4/letter/c/7cd45c/32.png) [@Cher](https://psychtoolbox.discourse.group/u/Cher)\ **Post date:** [February 16, 2021, 1:48pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667/3 "2021-02-16T13:48:41Z")
Thanks Mario, appreciate you responding. I’m trying to split a single display, works on macOS but not Windows 10. In Windows, stereomode=4 seem to only want dual displays. Stereomode=2 works fine in splitting top and bottom though, so do the anaglyph stereomodes. It’s fine, no need to reply. I could always manually program the split. Thanks again! ---
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [February 16, 2021, 4:59pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667/4 "2021-02-16T16:59:02Z")
Just ran `StereoDemo(4)` and `ImagingStereoDemo(4)` on a single-display setup and a dual-display setup, and both work exactly as expected: - Dual-Monitor: Left eye stim on left monitor, right eye on right monitor. - Single-Monitor: Split view. If i specify screen id as 1 or 2 i can get split-window on each of the two monitors in the dual monitor setup. Everything is fine on Win-10, so whatever it is must be either user error, or some malfunction of your system. Maybe reboot? Anyway, end of free advice. -mario ---
**Author:** ![Cher](https://avatars.discourse-cdn.com/v4/letter/c/7cd45c/32.png) [@Cher](https://psychtoolbox.discourse.group/u/Cher)\ **Post date:** [February 17, 2021, 4:07pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667/5 "2021-02-17T16:07:44Z")
No worries, we got it to work. Your advice was very helpful, thanks! ---
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [February 17, 2021, 7:57pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667/6 "2021-02-17T19:57:38Z")
Thank you’s are nice, financially contributing to PTB’s upkeep by buying a priority support license is better 🙂. Have a nice day, -mario ---
**Author:** ![Cher](https://avatars.discourse-cdn.com/v4/letter/c/7cd45c/32.png) [@Cher](https://psychtoolbox.discourse.group/u/Cher)\ **Post date:** [February 19, 2021, 2:23pm UTC](https://psychtoolbox.discourse.group/t/split-screen-stereomode-in-windows-10/3667/7 "2021-02-19T14:23:15Z")
Haha oh yes, I’m considering a license soon. 🙂