Re: How to use gksu to safely run a non-open-source application?

[Jack Dodds <brmdamon aci on ca>]

Thanks for your comments, Mart, Gustavo, and Zoran.  This is all very 
new to me and it's hard to get pointed in the right direction - all the 
information is out there somewhere but where does one start???!!!!

Zoran Rilak wrote:

> When you run your X, it defaults to allowing access to you and only to 
> you (i.e. only to processes which you own), so root cannot start XLib 
> apps on that display.

Perhaps you know enough about how X works to answer this question:

Let us suppose that an application owned by one user - in this case 
"realplay" - is authorized to put a window on the display owned by 
another user - in this case "jack".

How much information can realplay get from jack's display?  Obviously if 
realplay's window "has the focus" then X will send keyboard and mouse 
events to realplay's application.  Is there a way that realplay's 
application can get events (or other information) from jack's display 
when realplay's window DOES NOT have the focus?

(Hopefully there is not!)

Thanks again for your help.