XmTextSetSelection — A Text function that sets the primary selection of the text "XmTextSetSelection"

XmTextSetSelection sets the primary selection of the text in the widget.   It  also  sets  the  insertion
       cursor  position  to  the  last  position of the selection and calls the widget's XmNmotionVerifyCallback
       callbacks.

       widget    Specifies the Text widget ID

       first     Marks the first character position of the text to be selected

       last      Marks the last position of the text to be selected

       time      Specifies the time at which the selection value is desired. This should be the same as the time
                 of the event that triggered this request.  request. One source of a valid  time  stamp  is  the
                 function XtLastTimestampProcessed.

       For a complete definition of Text and its associated resources, see XmText(3).

XmTextSetSelection  —  A  Text  function that sets the primary selection of the text "XmTextSetSelection"
       "Text functions" "XmTextSetSelection"

XmText(3).

                                                                                           XmTextSetSelection(3)

       #include <Xm/Text.h>
       voidXmTextSetSelection(
       Widgetwidget,
       XmTextPositionfirst,
       XmTextPositionlast,
       Timetime);