Make F3 to copy key

;https://autohotkey.com/boards/viewtopic.php?f=5&t=33395&p=154913#p154913

$F3::
KeyWait, F3 ; wait for F3 released
KeyWait, F3, D T0.2 ; wait 1 second for F3 pressed again
If ErrorLevel ; if 1 second passes before F3 is pressed again
{
    Send ^c ; or whatever your copy code is
}
else ; we will now allow F3 to be pressed normally
{
    Loop
    {
        Send {F3 down}
        KeyWait, F3 ; wait for F3 release
        Send {F3 up}
        KeyWait, F3, D T1 ; wait 1 second for F3 pressed again
        If ErrorLevel ; if 1 second passes before F3 is pressed again
           Break ; exit his Loop
    }
}
return