Not quite sure what you want here (what is suppr?), but to send a Ctrl-Alt-Del signal to remote server, right-click the VNC viewer app in your taskbar and one of the options is send ctrl-alt-del.
20 useful ALT commands and keyboard shortcuts for Office 365 apps Your email has been sent To get access to the complete set of ASCII characters, users have to know and enter special keyboard shortcut ...
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