Not easily. If you have a UNIX application that can write data in a
format readable by WAVE, it should be possible in principle to run it
from WAVE's Analyze window, and to use WAVE to review the data
being acquired, using the 
button in WAVE's
Analyze window to read additional samples as they become available.
(WAVE will not attempt to read beyond what it thinks is the end of the
record; if it ever catches up with the digitizing process, therefore,
WAVE can only be forced to read further by using ,
or by closing and reopening the record.)