# problem with two monitors on a PC

**URL:** <https://psychtoolbox.discourse.group/t/problem-with-two-monitors-on-a-pc/873>\
**Category:** Uncategorized\
**Created:** [October 23, 2002, 7:16pm UTC](https://psychtoolbox.discourse.group/t/problem-with-two-monitors-on-a-pc/873 "2002-10-23T19:16:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [October 23, 2002, 7:16pm UTC](https://psychtoolbox.discourse.group/t/problem-with-two-monitors-on-a-pc/873/1 "2002-10-23T19:16:31Z")

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Maybe somebody can help me with this...  
  
For our experiments, I need to use two monitors and draw a   
rectangle that spans both of them. This works just fine on a Mac:   
I use OpenWindow command and set the rectangle as [0 0 2\*  
hor\_res vert\_res], where hor\_res and vert\_res are dimensions   
of a single monitor. No problem.  
  
On a PC, however, I cannot find a way to do it! When I try this   
simple thing, it just clips the window to one primary monitor (I   
checked the 'Rect' sub-function).   
  
The monitors seem to be set up fine (for example, when I drag   
the mouse over the edge of one screen, it appears on another   
screen). However, it seems that Matlab or Psychtoolbox doesn't   
recognize the secondary screen! When I call the 'Screens' sub-  
function, it returns zero. When I try to use screen number 1 in   
'OpenWindow', it gives me an error mesage.   
  
Could somebody please tell me if there is a way to use two   
screens with Psychtoolbox on a PC?  
  
Thanks a lot!  
  
Grigori Yourganov  
Centre of Vision Research  
York University  
Toronto, Canada