possible to make a running script with system events block user input?

I would like to find some command that blocks user input while this script runs, is that possible? How?

tell application "System Events"
	keystroke "Please! "
	delay 1
	keystroke "I need your help! "
	delay 1
	keystroke "My kludgy nature frustrates my maker! "
	delay 1
	keystroke "I must learn how to work without interference! "
	delay 1
end tell


it’s not possible

Ouch. Thanks again, Stefan