Enabling offscreen context support

The normal mode of Dittoing someone else's Photon session (specifying -n) is to have a single cursor that can be controlled by either the local or remote user. Similarly, keystrokes from either keyboard can be entered into the application with keyboard focus, which is normally what you want for a remote training or debugging session.

Offscreen context support is enabled by default, though you can turn it off with the -OO option.

Offscreen context support has some limitations: