Well, will all financial/sales transactions be handled from one point within the premises, or will employees be handling different parts of the business from different locations within the premises? If the former, one computer might be sufficient, although he might want to use one computer as a sales terminal and then have a separate computer for normal office tasks (word processing, spreadsheet, accounting, etc.). On the other hand, if multiple terminals are needed to allow different employees to process transactions for certain business functions, then that would necessitate more machines, and networking them might be required.
