HotKeySet Issue

[seadoggie01]

So I've looked at the help file and it doesn't seem to mention anything about this, but maybe I'm missing something.
I'm trying to use code like this...

HotKeySet("{ALT}{F9}", "MyExit")

While True
    ; Do stuff here... not important
    Sleep(100)
WEnd

Func MyExit()
    ConsoleWrite("MyExit called")
    Exit
EndFunc

But when I press Alt + F9 nothing happens. However, this code works...

HotKeySet("!{F9}", "MyExit")

While True
    ; Do stuff here... not important
    Sleep(100)
WEnd

Func MyExit()
    ConsoleWrite("MyExit called")
    Exit
EndFunc

(Note: the only difference is ! instead of {ALT})
Is this expected behavior? I just find the code easier to read when not using !^+ instead of {ALT}{CTRL} and {SHIFT}
The help for Send() seems to indicate that {ALT} is valid in it's table

Edit: Forgot to mention, running AutoIt Version 3.3.14.5

Edited April 25, 2019 by seadoggie01

[Melba23]

seadoggie0,

HotKeySet can only work on one key, possibly with one or more of the Shft/Ctrl/Alt/Windows modifier keys. The {ALT} keyword is used to define the Alt key itself - so your first attempt will not work as you are trying to use 2 keys - one of which cannot be used as it is one of the modifiers (as explained in the Help file).

Your second attempt is syntactically correct and so will work as expected.

M23