Your answer is in the userguide
3.3.2 Toggle USBHost:
Toggles the USBhostFS connection. With USBhostFS, you can browse your PC hard disks or
DVDROM drives via USB on your PSP. You'll need to install the usbhostfs driver on the PC and
run the nethostfs.exe server application before you can use this feature. More on this in the
section about setting up USBhostFS.
3.3.4 Toggle NetHost:
Toggles the NetHostFS connection. With NetHostFS, you can browse your PC hard disks or
DVDROM drives via WiFi on your PSP. See the Host File System section for details on setting up
nethostfs access.
6.2.2 NetHostFS:
For NetHostFS support, it's a bit more complicated as it involves a working internet connection
already present on your PSP. In order to proceed you should first set up a working internet
connection in the PSP's XMB and then go on.
Once you unzip the nethostfs archive to your PC (both Windows & Linux are supported), you
can launch it as follows. Unlike usbhostfs, however, you'll need to explicitly enable PSP keypad
redirection with -s option. You’ll also need to enable the option "Redirect Keypad to Host"
under iR Shell Configurator when using keypad redirection.
Please note: If your PC firewall asks if you want to allow nethostfs.exe access to the internet
then you will need to allow this at least for your local network (LAN). If you want to be able to
browse your PC files from a remote location via the internet then you will need to allow
nethostfs.exe to have access to the whole internet, of course.
Usage: nethostfs.exe [options] rootdir
rootdir: The defined dir will be used as root dir for PSP. Use /cygdrive if you want the PSP to
see all drives in your PC.
Options:
-p port TCP port number
-l login_password Password for client PSP to login
-c max_clients Maximum number of client PSPs, valid range 4-1000, default 20
-r Restrict to Read-Only access
-s Tells the nethostfs to enable keypad redirection. Please note if you connect more than 1 PSP
to the same nethostfs server with the '-s' option enabled, the keypad redirection will be
forwarded to all PSPs. You can have more than 1 nethostfs server running with each one
listening to a different port & serving different PSP.
-k disables keyboard redirection and only joypad will be redirected. This is similar to the "-k"
option for usbhostfs.
-h Print this help messages
Note on -r option:
This option is useful when you open your PC for public access via the Internet without worrying
about files being modified or deleted. You can also install various homebrews on the server
to allow others to run them from your PC without having the need to install them on their PSPs
(use the nethost redirection & enable Redirect APP View to Host). Some homebrews may need
to create files while they're running, such as updating high score files for games. In order to
achieve maximum compatibility all file update commands, issued by the PSP, will be simulated
without applying the updates on the file system. This means all update commands will return
successfully, so as not to cause any errors in homebrews.
Example
nethostfs -p 7513 -l mypass -r /cygdrive
This will allow your PSP to access all drives in your PC in read-only mode (-r), which means
you can't modify or delete any files. You'll also need to configure the following under iR
Configurator.
Sat Sep 15, 2007 8:14 pm 
i thought it would be in the tutorial section but yea my bad thxx