Parameter file used by BS Contact, a Web browser plug-in or standalone viewer that enables multi-user 3D collaborative and social environments leveraging DirectX and OpenGL; contains parameters for layout and connection information in text format.

The commonly referenced file "contact.bxx" contains parameters for the community server address, server port, scene BXX preferences file, 3D VRML scene file, world name, chat welcome message, layout frameset, designated HTML frame, voice support, and others. BS Contact was originally developed as "blaxxun Contact" by blaxxun Interactive, which was later acquired by Bitmanagement Software. Bitmanagement Software now develops BS Contact in several editions, including BS Contact Geo, BS Contact MPEG-4, BS Contact Mobile, BC Contact J, and BS Cave.