putting up text in a form

[Dan Zucker]

I know this sounds like a simple question, but I've spent a lot of time
pouring through the documentation and I still can't figure it out.  Is there
some simple way to put a string that is generated at run-time into a form?
I found the custom alert function, but this forces you to use an alert
resource.

What is the easiest way to do this?

Thanks,
Dan