document x* functions usage

src/x11.h

@@ -147,11 +147,11 @@ typedef void ( *FsbContinuation )( int proceed, char* file_name );
         Function prototypes
   ---------------------------------------------------------------------------*/
 
-void HandleXEvents( void );
+void HandleXEvents( void );               /* used in emulator.c */
-void IdleXLoop( unsigned long max_wait );
+void IdleXLoop( unsigned long max_wait ); /* used in emulator.c */
 
-void InitializeGui( int argc, char* argv[] );
+void InitializeGui( int argc, char* argv[] ); /* used in main.c */
 
-void ActivateFSB( char* title, char* file_name, FsbContinuation continuation );
+void ActivateFSB( char* title, char* file_name, FsbContinuation continuation ); /* used in x_func.c */
 
 #endif /*!_X11_H*/

src/x11_lcd.h

@@ -87,9 +87,9 @@
         Function prototypes
   ---------------------------------------------------------------------------*/
 
-void InitLcd( Display* lcd_display, Window lcd_window, unsigned long lcd_fg_pixel, unsigned long lcd_bg_pixel );
+void InitLcd( Display* lcd_display, Window lcd_window, unsigned long lcd_fg_pixel, unsigned long lcd_bg_pixel ); /* used in x11.c */
 
-void DrawLcd( void );
+void DrawLcd( void );    /* used in emulator.c */
-void RefreshLcd( void );
+void RefreshLcd( void ); /* used in x11.c */
 
 #endif /*!_DISPLAY_H*/

src/x_func.h

@@ -108,6 +108,6 @@
         Function prototypes
   ---------------------------------------------------------------------------*/
 
-void ExtendedFunction( Nibble function_code );
+void ExtendedFunction( Nibble function_code ); /* used in hdw.c */
 
 #endif /*!_X_FUNC_H*/