I may be wrong but I don't think that can be done with an Input box.

It can be done by creating your own input box and place the masking chr for
the textbox property PasswordChar

"kjworks" wrote:

The user clicks on a button. The button brings up an inputbox, which asks the
user to enter a password. The user enters the password which can be seen.
How can the entry be masked by asterisks? This way if someone is standing
behind them when they enter their password only asterisks can be seen.