ShapedForm

Create irregular shaped forms easily based on the forms picture property.
Add the control to the form and set the picture property then select which colour to become transparent.

This control does the rest.
You can even specify that the window can be dragged around the screen when the user clicks on any part of it.
Also contains methods to refresh the transparency and pop up a system menu.
Unregistered controls work in a limited Freeware mode so the control is still useful without purchasing a licence. Purchasing a licence releases the full potential of the control.
ActiveX control for VB6.