Star Wars Battlefront II (Classic 2005) 6 players Splitscreen on PC.

It tricks the game into thinking each player is playing on a separate PC via a virtual local area network (LAN). This allows up to 4 players on a single monitor or stretched across multiple displays. 2. Battlefront II Split-Screen Script (by ReShax / ModDB)

With modern hardware, you can now push this 20-year-old game far beyond its original limits: Visual Overhauls : You can combine split-screen setups with the Battlefront 2 Remaster Mod

The most definitive way to achieve this is through the (often found on ModDB or GitHub). Unlike simple configuration tweaks, this mod essentially tricks the game into running multiple instances or utilizes internal hooks to enable the legacy console UI. Why the PC Version is "Better" with Mods:

Released more recently, takes a different approach by restoring split-screen functionality already present in the game’s files but disabled by the developer. One creator noted: “I released SplitscreenWrangler to prove my point: DICE does extra work only to hide split-screen from PC players.” While the creator describes it as less stable than other options, it demonstrates how close the feature was to being officially available.

Some of the key features of these mods include: