Alternate Data Stream interrogation tool

First
Create a txt file with command: notepad.exe seeme.txt
View the content of the txt file: type seeme.txt (showing output)

Second
Create a txt file with command: notepad.exe seeme.txt:hidden.txt
You will not see the file by typing type seeme.txt (no output)
The only thing you can see it is type: notepad seeme.txt:hidden.txt