It looks like you're asking about a feature specific to an offline mod for 3DXChat (version 26, build 390).

1. Full character & outfit unlock – Access all subscription-locked clothes, accessories, tattoos, and body modifications without paying.
2. Local world editing – Ability to modify room/zone layouts, lighting, and assets directly without server sync.
3. Unlimited local props – Spawn any in-game object or prop without ownership restrictions.
4. Pose/animation player – Play any animation (including custom-loaded ones) without a partner or online session.
5. Local screenshot/machinima tools – Advanced camera controls, depth of field, and lighting overrides that normally require server permission.
6. No user limit in rooms – Locally bypass the per-room avatar limit (though only you are real, bots or clones may be placeholders).
7. Direct .xfr/.xps file import – Load custom assets (clothing, hair, accessories) without needing to pass the online asset validator.
8. Offline roleplay bots – Simple NPCs that mimic avatar movements/poses for solo storytelling.

While the official game thrives on its "Massively Multiplayer" aspect, the offline mod pivots the focus toward a sandbox experience. Users seek out this version for several key reasons:

Most community development has moved past Build 390. While it remains a popular "legacy" version for those seeking a free offline sandbox, official 3DXChat Community Forums

What Exactly Is “Ver26 Build 390”?

To understand the significance, we must look at versioning. Official 3dxChat updates are sequential. Version 26 (ver26) marked a milestone for the game, introducing:

Conclusion

Ensuring the game remains playable if official servers ever shut down. Performance:

• Modify the config.xml or .ini files to point to localhost.
• Use a "Launcher" or modified .dll files provided by the modding community.
• Ensure firewall permissions allow the game to run in a restricted environment.