a href="user_r.h#KEEPstatistics">qh_KEEPstatistics</a>
    enable statistic gathering and reporting with option 'Ts'
<li><a href="user_r.h#MAXoutside">qh_MAXoutside</a>
record outer plane for each facet
<li><a href="user_r.h#NOmerge">qh_NOmerge</a>
disable facet merging
<li><a href="user_r.h#NOtrace">qh_NOtrace</a>
disable tracing with option 'T4'
<li><a href="user_r.h#QHpointer">qh_QHpointer</a>
access global data with pointer or static structure
<li><a href="user_r.h#QUICKhelp">qh_QUICKhelp</a>
use abbrev