If webui connected to local sugar-network-client process, launching means
just executing an application by client process. So, such executing is any
time possible (from API provided by sugar-network-client).
If launching application is a Sugar Activity intended to run out of Sugar
Shell, such usecase does not related to SN. Techincally, it is possible
if all sugar dbus services run (shell services should be emulated to support
Shell UI less mode).