By company policy I must access Citrix via the web client to get to my work desktop. When I elect to go fullscreen, when I press ESC, the window pops back into the browser.
That would be fine if that's what I wanted. What I want is for ESC to be sent to the application I'm working in with my desktop.
I looked around and found that
launch.ica (the file that starts the remote session) can be customized, but didn't see anything related to this.