The derwin() function creates a subwindow within window orig, with the specified number of lines and columns, and upper left corner positioned at begin_x, begin_y relative to window orig. A pointer to the new window structure is returned.
The newwin() function creates a new window with the specified number of lines and columns and upper left corner positioned at begin_x, begin_y. A pointer to the new window structure is returned. A full-screen window can be created by calling newwin(0,0,0,0).
If the number of lines specified is zero, newwin() uses a default value of LINES minus begin_y; if the number of columns specified
is zero, newwin() uses the default value of COLS minus begin_x.
The subwin() function creates a subwindow within window orig, with the specified number of lines and columns, and upper left corner positioned at begin_x, begin_y (relative to the physical screen, not to window orig). A pointer to the new window structure
is returned.
The original window and subwindow share character storage of the overlapping area (each window maintains its own pointers, cursor location, and other items). This means that characters and attributes
are identical in overlapping areas regardless of which window characters are written to.
When using subwindows, it is often necessary to call touchwin(3XCURSES) before wrefresh(3XCURSES) to maintain proper screen contents.
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