Autohotkey, use F1 as prefix key but do NOT block Ctrl+F1, Shift+F1 etc

Using the following statement,

F1 & F9:: Msgbox, Got F1+F9

I can successfully use F1 as a prefix hotkey, quite a useful feature. However, I quickly find that Ctrl+F1, Shift+F1 etc lose their functionality, i.e. application cannot detect them.

I tried to add a tilde,

～F1 & F9:: Msgbox, Got F1+F9

but this always trigger F1 for application before I have the chance to press F9 -- not what I want.

How to achieve the desired result?

BTW: I can totally accept the minor side effect of firing F1, Ctrl+F1 or Shift+F1 when F1 is released.

Autohotkey 1.1.13.1

Answer

I figure it out myself.

F1 & F9:: MsgBox, F1+F9
*F1 up:: Send {Blind}{F1 down}{F1 up}

The {Blind} is important. Without it, pressing Shift+F1 will(may) cause application to get only F1. In my actual case, my application is EmEditor v14, and I have successfully achieve:

• F1+F9 or F1+F10 to quickly switch between first row tabs.


• F2+F9 or F2+F10 to quickly switch between second row tabs.


• F3+F9 or F3+F10 to quickly switch between third row tabs.


• F4+F9 or F4+F10 to quickly switch between fourth row tabs.


• use **F5+...* if desired

I do this because EmEditor, although great at many other aspects, does not provide a quick way to switch document tabs by keyboard.

If you're interested, I can post my whole script later, about 30 lines.