In private browsing allows you to log into a separate trial or different system and not have it interact or save user profiles that will interfere with any live systems that you run.
The below runs through how to do this for the major browsers
Internet Explorer
Open In-Private via the cog in top right of the browser
A new window will open
The address bar then should have InPrivate next to it
Edge
Open In-Private via the cog in top right of the browser
A new window will open
The address bar then should have InPrivate next to it
Chrome
In Chrome it’s the three dots top right and it’s called Incognito
The Tabs then have a “spy” hat and glasses icon
Firefox
Open Private via the cog in top right of the browser
A new window will open
The tab says private browsing