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SHELL.DLL
TO REGISTER IN WINDOWS HELP:
  RegisterRoutine("shell", "ShellExecute", "USSSSi")
ShellExecute(hWndApp,`open',`\\ascii\\1995\\tables\\950102.doc',`',`',3).  

The first parameter is supposed to be a Window Handle.

  ShellExecute(hwnd, lpszOp, lpszFile, lpszParams, lpszDir, fsShowCmd)  

Parameter	Description
	
  hwnd  	Identifies the parent window. This window receives any message boxes an application produces an error message box.[explanation correct?]
  LpszOp  	Points to a null-terminated string specifying the operation to perform. This string can be "open" or "print". If its parameter is NULL, "open" is the default value.
  LpszFile  	Points to a null-terminated string specifying the file to open.
  LpszParams  	Points to a null-terminated string specifying parameters passed to the application when the lpszFile parameter specifies an executable file. If lpszFile points to a string specifying a document file, this parameter is NULL.
  LpszDir  	Points to a null-terminated string specifying the default directory.
  FsShowCmd  	Specifies whether the application window is to be shown when the application is opened. This parameter can be one of the following values: 

1	  SW_NORMAL  	Activates and displays a window. If the window is minimized or maximized, Windows restores it to its original size and position (same as   SW_RESTORE  ).
2	  SW_SHOWMINIMIZED  	Activates a window and displays it as an icon.
3	  SW_SHOWMAXIMIZED  	Activates a window and displays it as a maximized window.
3	  SW_MAXIMIZE  	Activates a window and displays it as a maximized window.
4	  SW_SHOWNOACTIVATE  	Displays a window in its most recent size and position. The window that is currently active remains active.
5	  SW_SHOW  	Activates a window and displays it in its current size and position.
6	  SW_MINIMIZE  	Minimizes the specified window and activates the top-level window in the system's list.
7	  SW_SHOWMINNOACTIVE  	Displays a window as an icon. The window that is currently active remains active.
8	  SW_SHOWNA  	Displays a window in its current state. The window that is currently active remains active.
9	  SW_RESTORE  	Activates and displays a window. If the window is minimized or maximized, Windows restores it to its original size and position (same as   SW_NORMAL  ).