The only way to synchronize notes between multiple computers is through .Mac. With that said, you can keep multiple computers updated with the same notes using the backup and restore feature of SOHO Notes. Keep in mind that this method is not synchronization.

Computer A:

1. Launch SOHO Notes.

2. Choose File > Back Up Database > To a File, and save the backup to your Desktop.

3. Transfer the backup database to Computer B. 

Computer B:

1. Launch SOHO Notes.

2. Choose File > Restore Database > From a File, and select the backup file you transferred from Computer A.

3. Click Open. This will DELETE the current database and replace it with the database from Computer A.

When you're ready to go back to Computer A then do the following steps:

Computer B:

1. Launch SOHO Notes.

2. Choose File > Back Up Database > To a File, and save the backup to your Desktop.

3. Transfer the backup database to Computer A. 

Computer A:

1. Launch SOHO Notes.

2. Choose File > Restore Database > From a File, and select the backup file you transferred from Computer B.

3. Click Open. This will DELETE the current database and replace it with the database from Computer B.

This method only works if you only modify notes on one computer at a time.