  To directly detect exoplanets and protoplanetary disks, the development of
high accuracy wavefront sensing and control (WFS&C) technologies is essential,
especially for ground-based Extremely Large Telescopes (ELTs). The Subaru
Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is a high-contrast
imaging platform to discover and characterize exoplanets and protoplanetary
disks. It also serves as a testbed to validate and deploy new concepts or
algorithms for high-contrast imaging approaches for ELTs, using the latest
hardware and software technologies on an 8-meter class telescope. SCExAO is a
multi-band instrument, using light from 600 to 2500 nm, and delivering a high
Strehl ratio (>80% in median seeing in H-band) downstream of a low-order
correction provided by the facility AO188. Science observations are performed
with coronagraphs, an integral field spectrograph, or single aperture
interferometers. The SCExAO project continuously reaches out to the community
for development and upgrades. Existing operating testbeds such as the SCExAO
are also unique opportunities to test and deploy the new technologies for
future ELTs. We present and show a live demonstration of the SCExAO
capabilities (Real-time predictive AO control, Focal plane WFS&C, etc) as a
host testbed for the remote collaborators to test and deploy the new WFS&C
concepts or algorithms. We also present several high-contrast imaging
technologies that are under development or that have already been demonstrated
on-sky.
