This Excel spreadsheet demonstrates the use of command buttons and code to create an interactive checkbook register. By clicking command buttons, the user can enter transaction details and have them automatically posted to accounts. Accounts like checking, payables, and receivables are accessible through command buttons and display running balances through formulae. Pivot tables provide an alternative way to view the financial balance sheet showing balances across all accounts. The checkbook module shows how Excel can be used to build robust accounting applications through features like functions, command buttons, and code.