Pointers to Structures as Func Args

I have a header file to a WIN32 DLL.Lib  with the equivalent of this:

typedef struct
{
      int m;
} X_Y;

typedef  X_Y *X_Y;

// prototypes

void WINAPI Funct1(X_Y *px);     // px - a pointer to a struct X_Y;
void WINAPI Funct2(X_Y **ppx);   // ppx - a pointer to a pointer to struct X_Y;

-----------------------------------------------------

Questions:
(1) How do I code my program to call these two functions.
(2) How do I then access members?

(details please I'm a newbie programmer)

Thanks