Does WindowLong change during runtime?

The subject says it all.

Assume I am not ever calling SetWindowLong()

So I just leave the window and its properties alone.
Will the Long ever change???

See, I know before you can update a window's style, you have to get the current style through GetWindowLong, add or remove style's from it, then apply the new style through SetWindowLong.

I want to GetWindowLong once, and then set it whenever needed, could be once, could be a thousand times...

But, my thought is maybe the WindowLong is internally being changed now and then, so I may cause some unstability by doing what I wish to do.


See, I need to change a window's settings from a standard overlapped window, to a blank empty window (no settings cept visible).
Generally a window which goes from Full-Screen to Windowed mode and sets its style accordingly.

FullScreen Mode - WS_VISIBLE should be only style.
Windowed Mode - Anything really. At least an overlapped window.

The style doesn't change unless you directly/indirectly change it.

ShowWindow can change a few styles, like WS_VISIBLE, WS_MAXIMIZED and WS_MINIMIZED. ShowWindow is automatically called by the minimize, maximize and restore actions of the window frame (system menu and buttons at the top right). This is, to my knowledge, the only way the window style can change without explicit interference by the programmer.