While switching windows, I came across an unknown icon.
(screen shot taken with a camera as I do not know how to take a screen shot of the task switcher)
The icon in question is on the far left, showing a red, yellow and blue square/box, within a white box.
There is no description when this icon is selected.
After spotting the icon and attempting to check the task manager for a running program with the matching icon, it is no longer shown in the task switcher.

(screen shot taken with a camera as I do not know how to take a screen shot of the task switcher)
The icon in question is on the far left, showing a red, yellow and blue square/box, within a white box.
There is no description when this icon is selected.
After spotting the icon and attempting to check the task manager for a running program with the matching icon, it is no longer shown in the task switcher.