AHK: Assign hotkey only for one specific active window and not for others

Question

I have just done a piece of code that does the following thing. When I make a selection by mouse in Firefox or EndNote, the script sents a Ctrl+c and checks the clipboard fo

Answer 1

I see some very fundamental problems in the first few lines. Let me explain...
There are two types of if-statements in AutoHotkey If and #If. You usually always use the normal If-statements unless you are doing something with hotkeys and you want specific hotkeys to be context-sensitive.
Here are some important rules:
Normal If-statements have to use curly braces {} to mark the area of code that should be executed if the expression is true. If you don't use curly braces, the If-statement will work as if you had put curly braces around the first command directly under the If-statement.
Example:

If WinActive("Firefox") {
    Send, Test
    MsgBox, The script just typed "Test.
}

Another example:

If WinActive("Firefox")
    MsgBox, Firefox is the active window.

Normal If-statements cannot be used around a hotkey definition, but only within it.

This is allowed:

F1::
    If (A_OSVersion = "WIN_7") {
        MsgBox, Your operating system is Windows 7 and you just pressed F1.
    }
Return

This is NOT:

If (A_OSVersion = "WIN_7") {
    F1::
        MsgBox, Your operating system is Windows 7 and you just pressed F1.
    Return
}

But there is a way around that and that is #If-statements.
#If-statements don't use curly braces ever.
They can only be used on hotkey definitions.
And they can only be closed by another #If-statement.
(It's very common to simply use an empty #If to close it.)

Examples:

#If (A_OSVersion = "WIN_7")
    F1::
        MsgBox, Your operating system is Windows 7 and you just pressed F1.
    Return
#If

A more complex example:

#If (A_ScreenWidth >= 1920)
    F1::
        MsgBox, Your your screen is at least 1920 pixels wide.
    Return
    F2::
        MsgBox, Your operating system is %A_OSVersion%.
    Return
#If (A_ScreenWidth < 1920)
    F1::
        MsgBox, Your your screen width is smaller than 1920 pixels.
    Return
#If

As you might have guessed by now, hotkey definitions are always started by a pattern like this hotkey:: and closed by a Return. Although you can define hotkeys on a single line. Examples:

F1::MsgBox, Hello!
F2::a ;This will remap the F2 key to an a-key. 

Hotkeys by themselves do never use curly braces! Though an If-statement within a hotkey still has to use them according to the before mentioned rules.