We have a co-sourced internal audit arrangement and use electronic workpapers. Copies of current year and prior year are accessible here at the Bank on my computer. However, I obviously don't want an examiner to have that kind of access - it's just easy if they want to see something specific.
When we get our first day letter I let the firm know and they send copies of the WPs on CD. The WPs are locked at that point and are in a read only form. I just give them the CD and they do whatever they need to do for their records.
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With the lights out, it's less dangerous.