User's Manual Part 2

Glossary 271
captive portal
Acaptiveportalisa“landing”webpagethatausermust
view, and at which a user typically must accept prescribed
conditions for access, before access is per mi t t ed . Free WiFi
hotspots at business centers, airports, co↵ee shops, etc.,
typically permit access by means of a captive portal, where
after a user accepts the conditio n s, the MAC add r ess o f t h e
user’s device is permitted access for some period of time. In
the context of Polar3D printers, note that a Polar3D printer
cannot navigate itself thr ou g h a captive portal; so for a Po-
lar3D printer to get on a local network, the local network
must allow access to the Polar3D printe r (perhaps involv-
ing local network configuration to recognize the printer’s
MAC address) without requiring the Polar3D printer to do
an extra step of “viewing” or “agreeing to” some access
agreement. Th i s is the same sort of si t u at i o n for any hard-
ware device that needs to get on a local network. 8, 20, see
MAC ad d ress
Cartesian coordinates
Cartesian coordi n a t es are rectilinear coordinates, descr i b -
ing the position of a point in two-dimensional space via x
and y coordinates, or in three-dimen si onal space via x, y,
and z coordinates. Cartesi an coordinates are named after
the 17th century mathematician Ren´e Descartes who devel-
oped them; compare with polar coordinates. See also polar
coordinates