Hping includes a man page inside the tarball distribution, but this is probably not enough for most users. You can find links to a number of tutorials in the hping wiki at the External tutorials and articles page.
Other resourcesTo getting started with hping3 check this link
For a TCL introduction check my online book
Hping is connected to the idea of idle scan I invented in 1999 (if I remember correctly). Since I was too lazy to write a decent article, the great Fyodor wrote a very nice one, Idle Scanning and related IPID games.