An
indicator that specifies whether the target session should be flagged as
selectable or non-selectable.
Possible values are shown in the following list:
SET_SESSION_UNCHANGED
Leaves the current setting unchanged.
SET_SESSION_SELECTABLE
Makes the target session selectable.
SET_SESSION_NON_SELECTABLE
Makes the target session non-selectable. A non-selectable session is not
selectable from the Shell switch list, nor can the user jump to it via the
system hot key. The operator may continue to select a non-selectable windowed
session by pressing a mouse button within a visible part of the window.