Batocera utilizes a read-only filesystem squashfs for the operating system, with a writable partition for user data. The BIOS hierarchy is strictly defined to allow the backend emulator cores to locate necessary files without user intervention.
Batocera has one of the most seamless Netplay implementations. You can host or join rooms for retro games (up to N64/PS1 era generally) with friends across the internet. The "Netplay Lobby" is built directly into the main menu, allowing you to see who is playing what and jump in. full bios batocera