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I needed to implement the equivalent of an Excel GoalSeek is Lotus. Okay so imagine you have two forms, a "Machine" and an "Item" - an Item being linked to a Machine using the Machine's DocUNID. The Items each have a calculated value and the Machine has a balance which is calculated from the sum of the Item's values minus the cost of the machine, we want to change a each Item's value until it causes the Machine's balance to equal zero (with some limits). So here is the LotusScript agent which does the job - hope someone else may one day stumble upon this and find it handy (Disclaimer: I'm an admin with a little programming experience, so any problems with the code, please comment :) )

edit: Attached code.