Twin Peaks Software does provide its customers Accounts Payable and General Ledger modules to accompany its Order Entry, Inventory Control, Costing and Production modules in order to have an integrated suite. However, some customers have preferences and set ideas for what accounting software package must be used. At times, their needs are so unique that only few packages are considered. All through the years, engineers at Twin Peaks have created bridges to other accounting software with names such as QuickBooks, ACCPAC, Peachtree, Solomon, MAS90, and few others. Posting to such packages often involves debiting and crediting to accounts or exporting summary invoice information or even detailed invoices, depending on the requirements of the customer.