Can I force a window to regain the focus?

I have written (in C) a program which can load a large amount of data and so I am trying to produce a tick over. Ive created a modeless dialog box and all works fine until the window looses focus. Using SetWindow I can force the focus but this is permanently lost when (say) clicking on another window. The tickover remains frozen until the loading finishes.
I suppose what I want to do is force the focus every time I change the data displayed (after a number of reiterations).
Any suggestions appreciated.

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