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Ok, that works for one someThing, but if I have more than one parameter it tells me:

“-[AppDelegate transferIt:]: «class ocid» id «data optr000000003015240080600000» doesn’t match the parameters {someThing, someOtherThing} for transferIt_. (error -1721)”

app delegate contains:

on doItWith_(someThing, someOtherThIng)
-- do something with someThing and someOtherThing here, coercing them an AS class if required
end doItWith_

document contains:

current application's NSApp's delegate()'s doItWith_(someThing, someOtherThing)

where someThing and someOtherThing are what I want to pass.

…then you have to use more than one underscore. You’re calling methods between Cocoa classes, so you have to follow the Cocoa naming conventions with your handlers/methods.

Got it! Thank you very much - I hope I can make some progress now.
In case you’re wondering I’m rebuilding a huge app I made a few years ago in ASS. I put it off as long as I could.

Thanks,
Greg