Justin,
Regarding your "pbuf_flush" problem with the pqact(1) utility: would you
be willing to try a new release-candidate version of the LDM? In it, the
way the pqact(1) utility handles file descriptors has been considerably
modified and might solve your problem.
The release-candidate is
ftp://ftp.unidata.ucar.edu/pub/ldm/ldm-6.4.2.4.tar.Z
Regards,
Steve Emmerson