How do you programmatically resize and move windows with the Windows API?

Question

How do you programmatically resize and move windows with Windows API?

The scenario is: I want to vertically tile two windows (80%/20% width proportions).

Answer 1

You're looking for one of SetWindowPos, MoveWindow and AdjustWindowRectEx.

Can you be more specific about the scenario so that we can recomend the most appropriate API?