_nc_top_panel
returnPanel(EMPTY_STACK()? (PANEL *) 0 : _nc_top_panel);
result = EMPTY_STACK()? (PANEL *) 0 : _nc_top_panel;
_nc_bottom_panel = _nc_top_panel = pan;
assert(SP_PARM && SP_PARM->_stdscr && !_nc_bottom_panel && !_nc_top_panel);
_nc_top_panel->above = pan;
pan->below = _nc_top_panel;
_nc_top_panel = pan;
(_nc_top_panel) ? USER_PTR(_nc_top_panel->user, 2) : "--");
#define EMPTY_STACK() (_nc_top_panel == _nc_bottom_panel)
#define Is_Top(p) (((p) != (PANEL*)0) && !EMPTY_STACK() && (_nc_top_panel == (p)))
if ((pan) == _nc_top_panel) \
_nc_top_panel = (pan)->below;\