> PeachTree Complete Accounting is also a resonable accounting package if you need something that does a bit more than QuickBooks. It's actually a lot better than it used to be. It supports importing/exporting and DDE control. It has all the usual accounting stuff (A/R, A/P) plus Purchase Orders, Pick lists/Packing slips, job costing, inventory, and is multi-user (which QuickBooks FINALLY is) and custom reports.
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> But, depending on their accounting needs, Quickbooks may be a better alternative. I think it's easier to use than PeachTree and it's slanted more towards people who don't know much about accounting vs Peachtree which has a more formal accounting feel to it. I don't know if the new version of QuickBooks supports audit trails, though (which may or may not be important to your customer).

Peachtree is pretty limited as far as communication goes. A fair amount of data is made available with DDERequest, but really the only thing that you can Poke are journal entries. The backend is written in Btrieve and no attempt is made to expose it (although I'm sure it could be done with DBFTrieve or whatever else).