The graphics capabilities depend on the server.
PEXlib is built on PHIGS driver concepts and, so, matches PHIGS functions.
The only topic missing in PEXlib is Data Mapping.
TRIANGLE STRIP 3 WITH DATA, TRIANGLE STRIP WITH DATA, QUADRILATERAL MESH 3 WITH DATA, QUADRILATERAL MESH WITH DATA do not support individual edge control.
Some PEX servers implements CELL ARRAY by drawing only the edge of the rectangle defined by the CELL ARRAY points.