How to get the process ID of the current Excel, throught VBA, without relying on finding the window by the caption?

How can I get the process ID of the current Excel instance, that my VBA code is running in, without asking for it by the name in the caption... which causes a problem when I have two or more Excel instances with the same caption?

From stackoverflow

• You can use this method to get the current process id.

  Declare Function GetCurrentProcessId Lib "kernel32" () As Long
  

  This page has a good overview of exactly how you can do it in various versions of excel.

• thanks very much Its helped me in time..