I just installed and activated the PcNetworking app. It is great.
I must reiterate the warning from the app and the thread that Mickey330 linked to:
You can Brick the Ipad by messing with the file system. If you want to look around and have no intentions of changing anything, set read only to "on." I was curious, so I copied some configuration files to my desktop, before looking at them with an editor on the pc. I recommend this to others.
After you install the app, the configuration will be in the Extensions section of settings. Change the device name if you want. Put in a password. I recommend a hard to guess one. I also recommend turning networking off when you are not on your home (hopefully secured) wifi. I checked, and when you restart the ipad, the on/off setting is in the same state that you left it when it was on.
I also learned about Power saving. I was able to browse the file system for a few minutes after my Ipad locked and went black, then it became inaccessible until I unlocked it. It looks like there is a delay (I will test the exact delay and report it here) before the Ipad goes into power saving mode which kills the wifi.
Have fun and be careful.