Many thanks (months late, I know).
B) Section 4.2 "Sender Initialization"It can be difficult to set the initial value of tld to -1 since there may be implementations which use `unsigned' to store time units. Setting tld = 0 at initialisation has the same effect with regard to step (4) of section 4.3.
I changed it so that tld can be initialized to 0. - Sally http://www.icir.org/floyd/