desktop app - WAM integration

Hello,

We know that latest M365  desktop apps (word, excel, teams etc)  leverages  WAM (web account manager ) for their sign-in flows.

Web Account Manager (WAM) is more or less like SSPI, except it has a different API model and handles UI natively.

So my question is,

when desktop app uses WAM to get a token,  if WAM wants to do any interactive work with the user, for eg.,  perform second-factor 

 OR

 even collecting a brand new username-password (because user decided to use different account),   all these interactive flows happen through  native WAM UI   or   any kind of  browser-context is involved  ?

Thanks.