Perform the following activities:
A)DOS:
i)Display Directory Structure
ii) Clear Screen
iii) Display the content of file “mydosfile.bat”

B) WINDOWS:
i) Install a new printer and make it shareable
ii) Display the calculator in scientific mode
iii) Display system information of your computer
iv) Move the task bar from the bottom of the

C) UNIX:
i) Change the working directory to the root directory
ii) Display the name of all users logged in currently
iii) Use the PS command and try to kill any process owned by you 

A) DOS:

i) To display the directory structure in DOS, you can use the `tree` command. Simply open the command prompt and type `tree` followed by the path of the directory you want to display the structure for.

Example:
```
tree C:\Users\YourUsername
```

ii) To clear the screen in DOS, you can use the `cls` command. This will clear the command prompt window, giving you a clean slate to work _____ ____ __________ _____ _________ ________ _________ _______ ____ _____.
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