Help, with Send. (need it to stay pressed)

[Glyph]

HotKeySet("{end}","stopp")
InputBox("Key","Which key are you going to keep held down? ({end} {home} {alt} {!} a b c 1 2 3)")
$time=InputBox("Time","How long will you be streaming for? (in milliseconds)")
Opt("SendKeyDownDelay", $time)
While 1
send("{alt}")
sleep(10)
WEnd


func stopp()
Exit
EndFunc

there is my failed attempt.

What I want it to do is stay pressed down, until you press end.

[Thatsgreat2345]

HotKeySet("{end}","stopp")
InputBox("Key","Which key are you going to keep held down? ({end} {home} {alt} {!} a b c 1 2 3)")
$time=InputBox("Time","How long will you be streaming for? (in milliseconds)")
Opt("SendKeyDownDelay", $time)
While 1
send("{alt}")
sleep(10)
WEnd


func stopp()
Exit
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[Swift]

Send("{ALT DOWN}")

works too O.o