Library /sys$common/syshlp/decset$envmgr.hlb cgui, ok Btn  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Push the OK button to dismiss the dialog box and write changes
    made to the current context.

    The current changes are not written to the context file until
    after you either Apply or Save these changes. Changes are
    written to the current context in memory only.