Use one workbooks variables from another?

Is it possible, while using workbookA, to call a macro from workbookB and access the variables from workbookB's macro?

workbookB has a macro named newSession()

I run it from workbookA with:
Application.Run "workbookB!Module1.newSession"

newSession populates a Global variable session1
is it possible to access the variable session1 from the code in workbookA?

Define the variable as Public (instead of Dim). eg Workbook B would need a line like :-

Code:

---

Public MyVariable As String

---

How would you refer to the variable from the other workbook?

If session1 is a string, while the project is running I can go to the immediate window and type 'print session1' and it will print fine. If I activate any of the sheets in the other project and attempt the same print command, it returns a null value. Switch back the the original project and it retains its original value.

This happens with the variable declared both public and global (which I guess is the same in vba)