Possibly Stupid question: Blocking events to parent window

[Jack Challen <jack_challen ocsl co uk>]

First of all, sorry if this seems like a stupid question, but I have
searched the mailing list archives, plus all the documentation and
references I could find.

        I'm bashing out a program (surprise) and I have a button that creates a
child window by using a callback function - the thing is, I want to
ignore all input to any other window except the newly created child
window, until the user performs some abitrary action in the child (like
filling in a bunch of text boxes). I could post some source code, but my
current stuff is fairly convoluted (read "absolutely unreadable"), and I
didn't think it was worth posting for such a (hopefully) simple
question.

        I've got Havoc Pennington's book on order, which'll take about 2 weeks
to get here, and it feels like I'm banging my head against a brick wall
- I imagine I am, and there's a really easy way to do it. 

        Many thanks in advance.
        Jack Challen