.Overview "Tracing"
The lq-text tracing mechanism may seem a little complex at first, because
it provides a rich \*[+c]API\*[-c]. 
The functions bear close investigation, as they are used extensively
within all of the lq-text code, and are designed to be very efficient.
.P
You can turn on or off tracing on any of a large number of features separately,
using symbolic constants or string names.
.P
The \*[+sc]LQT_Trace\*[-sc] function has an interface similar to
\*[+var]printf\*[-var], and is thus very straight forward to use.
.P
The macro \*[+sc]LQT_TraceFlagsSet\*[-sc] is very efficient and can be used
in a test to surround code that is only used when debugging or when providing
more verbose progress messages than usual.
./Overview
