Change status for a groupvalue. All groups of groupType setNow(1) have unchanged(1) status. Status for groups of groupType applyConfirm(2): Initially, all values have unchanged(1) status. When some of group values are changed in new configuration, groupStatus is changed(2). When APPLY is made for a group, groupStatus is applied(3). When CONFIRM is made for a group, groupStatus returns to unchanged(1). Status for groups of type afterReset: If startup values in the group are different from running values, groupStatus is changed(2), otherwise unchanged(1). Writing applied(3) to the groupStatus makes APPLY operation on a group. APPLY operation is allowed only for groups of groupType applyConfirm(2). Other write operations should report error.