Quintus Prolog

Display attributes include:

bitmap_bit_order(V): Is leftmost bit in bitmap least or most significant? Either lsb_first or msb_first.
bitmap_pad(N): Number of bits each scanline must be padded to.
bitmap_unit(N): Size of the bitmap's unit, in bits.
connection_number(N): Connection number for display (fd under UNIX).
default_screen(V): The default screen for this display.
display_string(S): The name of this display, as an atom.
image_byte_order(V): Is leftmost byte in scanline least or most significant? Either lsb_first or msb_first.
protocol_revision(N): Minor X protocol revision number.
protocol_version(N): The major X protocol version (usually 11).
q_length(N): Number of events in display's input queue.
screen(N, S): S is Screen number N of this display (0 origin).
screen_count(N): Number of screens available on this display.
server_vendor(V): The name of the supplier of this server, as an atom.
vendor_release(V): The vendor's release number for this server.