I guess if that is the only option it would work, but on VNC for example… especially on a linux box where Ctrl-Alt-Del can actually be unmapped… it is actually easier to just remove the BLOCK for Ctrl-Alt-Del. That is the way VNC, RDP, and some other protocols and viewers handle on a linux desktop. A Ctrl-Alt-Del on the host just automatically goes through to the computer being remotely controlled if Ctrl-Alt-Del isn’t mapped on the Linux box running the viewer.