windows - Why do certain commands not show up when you type "help" in cmd.exe?

For instance, netstat. This doesn't show up when you type help, but netstat /? does provide the information.

Are there any other commands that will not get listed?

Also, the command netstat /? > netstat.txt won't work. Any idea why?
The netstat.txt file is created but remains empty.

I have write-permission on the map and the CMD.EXE is running as admin.

Answer

netstat.exe is a separate executable that lives in C:\Windows\system32 (or at least it does on XP), rather than being a command within cmd.exe.

There will be a large number of other executables in this folder (and others in the Windows tree) that won't show up when you type help from within cmd.exe.