Private (module-level) variables can be seen by any routine in the module they were declared in, but not from other modules.

 

Option Explicit
Private mintAge As Integer
Private Sub cmd()
  mintAge = mintAge + 1
  Debug.Print mintAge
End Sub

1.	Declare sub
2.	Creating Procedures
3.	Passing Arguments to Subroutines and Functions
4.	Passing Elements of an Array to Another Procedure
5.	Public Variables
6.	Use If and ElseIf to check the parameter
7.	Pass double to sub module
8.	Calling Functions and Sub Procedures
9.	The Call Statement
10.	Only place parentheses around the arguments when calling a function and making use of the return value from the function procedure
11.	Calling the function from a Sub procedure
12.	an Exit Sub just before the error label, which forces the subroutine to exit immediately, without erroneously running the error code.
13.	Optional parameters

Private (module-level) variables can be seen by any routine in the module they were declared in, but not from other modules. : Sub « Language Basics « VBA / Excel / Access / Word