FUNCTION  popvstk()

     This function will save the pertinent cursor information before
you do some screen changes.  When invoking popvstk() the previous
cursor attributes will be restored.  This information includes the
cursor type, row, column and color.

     Before calling popvstk(), the pushvstk() function must have been
called.  There is a one to one relationship between the pushvstk() and
popvstk() function calls.

RETURNS   None.