There is a good series of articles on Fund Accounting on the Christian Computing Magazine web site, written by an accountant staff member from Icon Systems, the authors of the online fund accounting program IconCMO. (It is more expensive, and more comprehensive, than ACCOUNTS, but fairly similar in its fund accounting design.)
You can see the four parts of that article at Part 1, Part 2, Part 3, and Part 4. Where their articles refer to their product’s contributions module, that would be the equivalent of the Software4Nonprofits DONATION program. Their accounting module would be the equivalent of this ACCOUNTS program.
I’m going to include a version of the above two paragraphs in my Help topic on Accounting Concepts as well, in the sub-section of that page on Fund Accounting.