Already using Ctrl + Alt + End to connect to Remote Desktop? You could use AutoHotkey
Some network administrators often run into issues when they try to send Ctrl+Alt+End command to a Remote Desktop PC. However this problem can easily be solved using AutoHotkey.
The issue is for example you have already mapped Ctrl + Alt + End, which is the default key Remote Desktop uses to run Ctrl + Alt + Del command in the remote PC.
AutoHotkey allows network administrators to send keystrokes to applications. Open AutoHotkey and type Control+Alt+Del in a text area, and save it in the remote user.