[Newbies] Modal UI

[Sean P. DeNigris]

In the process of my app's execution, it needs to put up a UI, and pause
until the UI returns an object (only this piece of code needs to pause, the
rest of the world can keep going).  I was thinking of using forks, but
FillInTheBlankMorph seems to manually drive the world's doOneCycle while it
waits (seems ugly and a little too controlling).

What would be the best way?

Thanks.
Sean
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