[ns] What's the mean of "h"?

[Pepe Lupen]

Hi, can anyone tell me the meaning of "h" and "A" at the first column of 
trace file?

Thanks!

d 0.584552 2 10 ack 40 ------- 1 8.0 0.7 15 1735
d 0.584552 1 10 ack 40 ------- 1 8.0 0.7 15 1735
r 0.584659 1 0 ack 40 ------- 1 1.0 0.0 458 1736
+ 0.584659 0 1 tcp 552 ------- 1 0.0 1.0 553 1789
r 0.584696 10 0 ack 40 ------- 1 8.0 0.7 15 1685
h 0.584696 0 10 tcp 552 ---A--- 1 0.7 8.0 16 1790
r 0.584784 0 1 tcp 552 ------- 1 0.0 1.0 483 1627
+ 0.584784 1 0 ack 40 ------- 1 1.0 0.0 471 1791
- 0.584784 1 0 ack 40 ------- 1 1.0 0.0 471 1791
- 0.584941 0 1 tcp 552 ------- 1 0.0 1.0 507 1683
r 0.585101 1 0 ack 40 ------- 1 1.0 0.0 459 1738
+ 0.585101 0 1 tcp 552 ------- 1 0.0 1.0 554 1792
r 0.585226 0 1 tcp 552 ------- 1 0.0 1.0 484 1629
+ 0.585226 1 0 ack 40 ------- 1 1.0 0.0 471 1793

_________________________________________________________________
Un amor, una aventura, compañía para un viaje. Regístrate gratis en MSN Amor 
& Amistad. http://match.msn.es/match/mt.cfm?pg=channel&tcid=162349