Before getting back into the difficulties of Replace, I decided to get my head back into the code by tackling the relatively simpler FindAll functionality, which involves retrieving and storing a KWIC-style display for the user, who can then double-click on individual hits to view them in the GUI. Got this working fairly well, although one bug remains: the WholeWordOnly setting doesn't seem to be passed through, or if it is passed through, it doesn't seem to be honoured by the FindNext function. This needs to be fixed. I should also test the MatchCase parameter.