Questions from me (two languages Polish and English version)

[RAFAELO3PLSX]

Wersja POLAND
Witam chciałbym zakupić urządzenie ale jedno mnie powstrzymuje pytanie :
-Mogę być zalogowany na steam PC i na urządzeniu Steam Deck jednocześnie? (2 urządzenia bez Wylogowania =PC i Steam Deck)
-Czy musze non stop logować się albo PC albo Steam Deck?
Przepraszam za mój angielski. I dekuje za odpowiedzi .
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English version
Wersja POLAND
Hello, I would like to buy a device, but one question stops me:
-Can I be logged in to Steam PC and Steam Deck at the same time? (2 devices without Logout = PC and Steam Deck)
-Do I have to log in to either PC or Steam Deck all the time?
Sorry for my English. And thanks for the replies.
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[WarnerCK]

You can be logged in to multiple devices at the same time (and it's necessary for Remote Play, for example). What you can't do is play one game on one logged in device and another game on a different logged in device: one of them has to be in offline mode.

You have to be logged in (unless you're running DRM-free games directly from the executable without running Steam), so that Steam knows which games you have access to. You don't need to be online, though, except for some games that insist on being online to function.