Window/Form on top

How can we know which form in on the top? and how can we minimize it? or change the size of the form?

[Silicon Valley]

To minimize the form.
form1.windowstate = 1

To change the forms size
form1.width = ?
form1.height = ?

How can we know which form in on top most, and i know we can change the size of the form but how can we have the name of the form? i was saying the fomrs might not in our program... like there are few free internet access.. so wonder how can i catch teh "form" -- the banner...