NAME
	GetVisualInfoA -- get information GadTools needs for visuals. (V36)
	GetVisualInfo -- varargs stub for GetVisualInfoA(). (V36)

   SYNOPSIS
	vi = GetVisualInfoA(screen, tagList)
	D0                  A0      A1

	APTR vi = GetVisualInfoA(struct Screen *, struct TagItem *);

	vi = GetVisualInfo(screen, firsttag, ...)

	APTR vi = GetVisualInfo(struct Screen *, Tag, ...);

   FUNCTION
	Get a pointer to a (private) block of data containing various bits
	of information that GadTools needs to ensure the best quality
	visuals.  Use the result in the NewGadget structure of any gadget
	you create, or as a parameter to the various menu calls.  Once the
	gadgets/menus are no longer needed (after the last CloseWindow),
	call FreeVisualInfo().

   INPUTS
	screen - pointer to the screen you will be opening on. This parameter
		 may be NULL, in which case this function fails.
	tagList - pointer to an array of tags providing optional extra
		  parameters, or NULL.

   TAGS
	There are currently no tags defined for this function.

   RESULT
	vi - pointer to private data, or NULL for failure

   SEE ALSO
	FreeVisualInfo(), intuition/LockPubScreen(),
	intuition/UnlockPubScreen()