_s_m_p_r_o_x_y allows X applications that do not support X11R6 session
management to participate in an X11R6 session.
In order for _s_m_p_r_o_x_y to act as a proxy for an X application, one of
the following must be true:
- The application maps a top level window containing the
WWMM__CCLLIIEENNTT__LLEEAADDEERR property. This property provides a pointer to
the client leader window which contains the WWMM__CCLLAASSSS, WWMM__NNAAMMEE,
WWMM__CCOOMMMMAANNDD, and WWMM__CCLLIIEENNTT__MMAACCHHIINNEE properties.
or ...
- The application maps a top level window which does not contain the
WWMM__CCLLIIEENNTT__LLEEAADDEERR property. However, this top level window
contains the WWMM__CCLLAASSSS, WWMM__NNAAMMEE, WWMM__CCOOMMMMAANNDD, and
WWMM__CCLLIIEENNTT__MMAACCHHIINNEE properties.
An application that support the WWMM__SSAAVVEE__YYOOUURRSSEELLFF protocol will receive a WWMM__SSAAVVEE__YYOOUURRSSEELLFF client message each time the session manager issues a checkpoint or shutdown. This allows the application to save state. If an application does not support the WWMM__SSAAVVEE__YYOOUURRSSEELLFF protocol, then the proxy will provide enough information to the session manager to restart the application (using WWMM__CCOOMMMMAANNDD), but no state will be restored.