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SAP Netweaver Business Client
As far as I understand it the SAP Netweaver Business Client is essentially the next evolutionary step for the standard SAP GUI. So you can execute classic sap dynpro's (dialog screen programs) allowing you to perform most of the functionality you now use the current windows SAP gui for, although I'm not sure every transaction will be accessible through this or there may be some specialized transactions which are easier to using via the standard SAP GUI. In addition to being able to access classic screen dialogs you can also use the SNBC to run web based applications such as Web Dynpros, BSP pages, iViews and other portal pages etc etc Here is a useful PDF document explaining the SAP Netweaver Business Client in more details.