This message is used to set the text of a window.
This parameter is unused and should be zero.
A pointer to a null-terminated string holding the new window text.
Zero is returned if the text was successfuly set. Typically, control classes return a negative value if the setting of text failed.
The default window procedure sets the text and displays it in the window.
For a standard window, the text is displayed in the title bar. button controls use the text as the button name, and edit controls use the text as the contents of the control. Other classes place their own interpretation on the window text.