xm_attach (w, where, ...)
Widget w;
char *where;

     xm_attach permits specification of XmForm child  attachments
     in  a  simple and consise manner.  _w_ is the widget ID of the
     Form child.  _where_ is a four-character string  specifying  the
     top,  left,  right,  and  bottom attachments, in that order.
     Each character determines the  attach  type  and  subsequent
     args read, as follows (all non-widget args are integers):

          n    ATTACH_NONE
          f    ATTACH_FORM (offset)
          F    ATTACH_OPPOSITE_FORM (offset)
          w    ATTACH_WIDGET (widget, offset)
          W    ATTACH_OPPOSITE_WIDGET (widget, offset)
          p    ATTACH_POSITION (position)
          s    ATTACH_SELF
          -    do not attach this side

     Example:

          xm_attach(button1, "fnwp", 5, button2, 5, 20);

     is equivalent to the following mess:

          XtVaSetValues(button1,
                        XmNtopAttachment, XmATTACH_FORM,
                        XmNtopOffset, 5,
                        XmNleftAttachment, XmATTACH_NONE,
                        XmNrightAttachment, XmATTACH_WIDGET,
                        XmNrightOffset, 5,
                        XmNrightWidget, button2,
                        XmNbottomAttachment, XmATTACH_POSITION,
                        XmNbottomPosition, 20,
                        (char*) NULL);