In the newer versions of photoshop you have an HDR option, you can also get a faux hdr style in most processing software. True hdr requires several images shot at different exposures which are then blended together (the best bits of each essentailly) in the hdr software. My personl favorite is Photomatix, but Nik HDR effx pro is also popular, others includ Oleono, Dynamic photo hdr, Artizen, luminance hdr, and many others.