Apache - Significado del log

Estuve revisando los log de mi servidor web con apache y en Review Server Log Files, sale esto, que significa estos logs, alguien me puede explicar o donde saco informacion para analizar todo lo que pasa en mi servidor web.
Gracias.

Review Access Log:
201.230.159.90 - - [20/Jun/2006:21:38:25 -0500] "recipientid=101&sessionid=9854" 501 329
201.230.159.90 - - [20/Jun/2006:22:11:23 -0500] "recipientid=105&sessionid=6359" 501 329

Review Error Log:
[Tue Jun 20 18:22:29 2006] [notice] Parent: Created child process 2088
[Tue Jun 20 18:22:30 2006] [notice] Child 2088: Child process is running
[Tue Jun 20 18:22:30 2006] [notice] Child 2088: Acquired the start mutex.
[Tue Jun 20 18:22:30 2006] [notice] Child 2088: Starting 250 worker threads.
[Tue Jun 20 18:35:33 2006] [warn] (OS 64)El nombre de red especificado ya no está disponible. : winnt_accept: Asynchronous AcceptEx failed.
[Tue Jun 20 21:38:26 2006] [error] [client 201.230.159.90] Invalid method in request recipientid=101&sessionid=9854
[Tue Jun 20 22:11:23 2006] [error] [client 201.230.159.90] Invalid method in request recipientid=105&sessionid=6359