Version 1.0.0.6, updated example for pass through option

AutoHotkey_example.ahk

@@ -18,9 +18,43 @@ MsgFunc(wParam, lParam, msg, hwnd)
   OnUniqueKeyboard(wParam, lParam & 0xFF, (lParam & 0x100) > 0, (lParam & 0x200) > 0, (lParam & 0x400) > 0, (lParam & 0x800) > 0, (lParam & 0x1000) > 0, (lParam & 0x2000) > 0, (lParam & 0x4000) > 0, (lParam & 0x8000) > 0)  	
 }
 
+; do not modify
+byte2hex(int)
+{
+	; based on https://www.autohotkey.com/boards/viewtopic.php?t=3925
+	; used when doing "passthroug"
+	HEX_BYTE := 2
+	while (HEX_BYTE--)
+	{
+			n := (int >> (HEX_BYTE * 4)) & 0xf
+			h .= n > 9 ? chr(0x37 + n) : n
+			if (HEX_BYTE == 0 && HEX_BYTE//2 == 0)
+					h .= " "
+	}
+	return h
+}
+
+; do not modify
+DoPassThrough(KeyboardNumber, VKeyCode, IsDown, WasDown, IsExtended, LeftCtrl, RightCtrl, LeftAlt, RightAlt, Shift)
+{
+	VKeyCodeHex := byte2hex(VKeyCode)
+	PassThroughKey := "{vk" . VKeyCodeHex . "}"
+
+	if (LeftCtrl || RightCtrl)
+		PassThroughKey := "^" . PassThroughKey
+
+	if (LeftAlt || RightAlt)
+		PassThroughKey := "!" . PassThroughKey
+
+	if (Shift)
+		PassThroughKey := "+" . PassThroughKey
+
+	Send %PassThroughKey%
+}
+
 ; KeyboardNumber - configured by you in MultiKB_For_AutoHotkey, this identify keyboard device
 ; VKeyCode - Key Code, https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes 
-; IsDown - is key pressed or released
+; IsDown - is key pressed or released, use "if (!IsDown)" if you like to register only key up, without this your code will be executed twice on key down and key up
 ; WasDown - like IsDown but this is previous state of this key
 ; IsExtended - is it normal or extended key (multimedia key, right alt/ctrl etc.)
 ; LeftCtrl, RightCtrl, LeftAlt, RightAlt, Shift (any) - is corresponding "control key" pressed at the same time
@@ -32,8 +66,12 @@ OnUniqueKeyboard(KeyboardNumber, VKeyCode, IsDown, WasDown, IsExtended, LeftCtrl
 	; example, remove, keyboard 1 - "G" + RightCtrl + LeftAlt + Shift
 	if (KeyboardNumber = 1 and VKeyCode = 71 and RightCtrl and LeftAlt and Shift)
 		MsgBox "Test message"
+	; if you want to pass all other keys as normal then add code like below 
+	else if (!IsDown)
+	{
+		DoPassThrough(KeyboardNumber, VKeyCode, IsDown, WasDown, IsExtended, LeftCtrl, RightCtrl, LeftAlt, RightAlt, Shift)
+	}
 
 	; ---> Add your code below <---
 
-
 }

MultiKB_For_AutoHotkey.dproj

@@ -125,8 +125,8 @@
     <PropertyGroup Condition="'$(Cfg_2_Win64)'!=''">
         <AppEnableRuntimeThemes>true</AppEnableRuntimeThemes>
         <AppDPIAwarenessMode>PerMonitorV2</AppDPIAwarenessMode>
-        <VerInfo_Build>2</VerInfo_Build>
-        <VerInfo_Keys>CompanyName=;FileDescription=$(MSBuildProjectName);FileVersion=1.0.0.2;InternalName=;LegalCopyright=;LegalTrademarks=;OriginalFilename=;ProgramID=com.embarcadero.$(MSBuildProjectName);ProductName=$(MSBuildProjectName);ProductVersion=1.0.0.0;Comments=</VerInfo_Keys>
+        <VerInfo_Build>6</VerInfo_Build>
+        <VerInfo_Keys>CompanyName=;FileDescription=$(MSBuildProjectName);FileVersion=1.0.0.6;InternalName=;LegalCopyright=;LegalTrademarks=;OriginalFilename=;ProgramID=com.embarcadero.$(MSBuildProjectName);ProductName=$(MSBuildProjectName);ProductVersion=1.0.0.0;Comments=</VerInfo_Keys>
     </PropertyGroup>
     <ItemGroup>
         <DelphiCompile Include="$(MainSource)">

src/VK_Codes.pas

@@ -31,7 +31,7 @@ implementation
     {  6} (VK_Name: 'VK_XBUTTON2'; VK_Description: 'X2 mouse button'),
     {  7} (VK_Name: ''; VK_Description: 'Undefined'),
     {  8} (VK_Name: 'VK_BACK'; VK_Description: 'BACKSPACE key'),
-    {  9}  (VK_Name: 'VK_TAB'; VK_Description: 'TAB key'),
+    {  9} (VK_Name: 'VK_TAB'; VK_Description: 'TAB key'),
     { 10} (VK_Name: ''; VK_Description: 'Reserved'),
     { 11} (VK_Name: ''; VK_Description: ''),
     { 12} (VK_Name: 'VK_CLEAR'; VK_Description: 'CLEAR key'),