>How would you go about changing the currency in all reports from a dollar sign to a euro sign or British pound sign or another?

How is it specified currently? SET CURRENCY TO will change the currency symbol. But if it's encoded into a character string, you can use a ReportListener object and intercept the incoming string and replace all instances of the $ with something else.

You can also open up each .FRX file as a .DBF and update the value you'd like to change if you have a way to set it globally. To find out what to change, copy the report, delete everything except the one thing you want to change as an example, and then compare the two frx files together using sys(2007, x) where x is each field name tested one-by-one in a loop until you find out which fields have changed.