GetCWMgrPort
CGrafPtr *wPort; receives the pointer value
This function obtains a CGrafPtr to allow you access to the Window Manager's *wPort is a pointer to a CGrafPtr. Upon return, it will contain a
WMgrCPort value you can use to find out about the Window
Manager's color graphics environment.
Notes: When using 'WDEF' resources, all drawing is done in the WMgrCPort.