Consistency: "{\bf ...}" ==> "\strong{...}"
"{\em ...}" ==> "\emph{...}"
Not at all sure what to do with "{\rm ...}".
Leaving it for now.
diff --git a/Doc/libctb.tex b/Doc/libctb.tex
index 073c649..c9756d1 100644
--- a/Doc/libctb.tex
+++ b/Doc/libctb.tex
@@ -54,7 +54,7 @@
asynchronously, with the callback routine being called upon
completion.
-{\em Note:} for reasons beyond my understanding the callback routine
+\emph{Note:} for reasons beyond my understanding the callback routine
is currently never called. You are advised against using asynchronous
calls for the time being.
\end{datadesc}