How to assign value to a Global Variable for global use

I have a string Application.hWndAccessApp that appears in multiple lines of code to call a custom MsgBoxT. Instead of writing Application.hWndAccessApp at every instance across modules and classes, I would like it to be assigned to a public variable such as hid as string. I know about declaring a public variable and then assigning it a value within a function or SubRoutine.

Here, I would like that value to be assigned globally so that it becomes available across all modules/classes every time I want to use MsgBoxT function.

EDIT: I followed the tip from comments below but it gives Error # 13: Type Mismatch.

Global Const hid = "Application.hWndAccessApp"

Then I call it using function below:

MsgBoxT hid, "Record Updated!", "Confirmation", VbInformation, 0 , 1000

My MsgBoxT function is declared publicy:

Public Declare PtrSafe Function MsgBoxT _
Lib "user32" _
Alias "MessageBoxTimeoutA" ( _
   ByVal hwnd As LongPtr, _
   ByVal lpText As String, _
   ByVal lpCaption As String, _
   ByVal wType As VbMsgBoxStyle, _
   ByVal wLange As Long, _
   ByVal dwTimeout As Long) _
As Long