Password Field on Selection-screen

The following code sets a PARAMETER to be a password input field, where for security purposes only *'s are displayed on the screen during input i.e. Password: ******* 

 Parameters: p_password like sy-uname.
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*AT SELECTION-SCREEN OUTPUT.
AT SELECTION-SCREEN OUTPUT.
loop at screen.
  check screen-name eq 'P_PASSWORD'.
  move: 1 to screen-invisible.
  modify screen.
endloop.

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