It depends what you want to share. Most of the time you Download an app like USB disk and use iTunes to copy files between the iPad and the pc. But there are other options like dropbox that allows you to have access to docs on the cloud. I use this often
There is apps for the Ipad available to do just about every function/program that could could find for a PC. There is an Ipad app called Evernote with versions even running on Linux and Windows!