Although, some of this information can be seen if you view the Properties of the File (in Windows Explorer for example), most graphics programs give you easy tools to read and modify all the IPTC information.
Bob demonstrated with the (free) program Irfanview (available for download from the author's website at http://www.irfanview.com/main_download_engl.htm) but many other readily-available programs, such as XnView, offer similar tools. You can review the key slides here in a pdf document.