Collaboration session with designated control pen

A computer-readable storage medium storing instruction that, when executed by a computing system, cause the computing system to perform operations for providing a collaboration session at least between first and second computing devices configured to receive graphical content, wherein the first computing device is associated with a physical pen tool configured to interact with a first display area, and wherein the second computing device is associated with a virtual pen tool configured to interact with a second display area, and wherein the operations comprise:

• receiving a request from the first computing device for the physical pen tool to be designated as a control pen;
• in response to the request, designating the physical pen tool as the control pen and disabling the virtual pen tool so long as the physical pen tool is designated as the control pen;
• modifying the graphical content based on the interactions made with the designated control pen at the first display area;
• and
• globally displaying the graphical content, wherein globally displaying the graphical content includes providing the modified graphical content to the second computing device for display at the second display area.

A computing system for providing a collaboration session, the system comprising:

• a first computing device configured to display graphical content at a first display area and to detect interactions made using a first pen tool at the first display area;
• a second computing device configured to display the graphical content at a second display area and to detect interactions made using a second pen tool at the second display area;
• and
• a third computing device comprising a computer-readable storage medium storing instructions that, when executed by the third computing device, cause the computing system to perform operations, the operations comprising—
• receiving a request from the first computing device for control of a control pen,
• in response to the request, identifying the first pen tool as the control pen and preventing the second pen tool from modifying the graphical content,
• modifying the graphical content based on the interactions made using the first pen tool when it is identified as the control pen, and
• providing the modified graphical content to the second computing device for display at the second display area.