Locating variables in nested modules

Questions
1

This code works.

Module [{x1, x2},
  Module [{},
   x1 = "111";
   ];
  Module [{},
   x2 = "222";
   ];
  Row [{x1, "-", x2}]
  ]

The same code separated into three attachments does not work.
What am I doing wrong? What is the solution?
Thanks a lot.

pp0.nb (3.65 KB)
pp1.nb (1.57 KB)
pp2.nb (1.49 KB)

2

Check out the “possible issues” section of the documentation for NotebookEvaluate[]. It looks like you might have to set the context.