  Our main result is a local-to-global principle for Morse quasigeodesics, maps
and actions. As an application of our techniques we show algorithmic
recognizability of Morse actions and construct Morse ``Schottky subgroups'' of
higher rank semisimple Lie groups via arguments not based on Tits' ping-pong.
Our argument is purely geometric and proceeds by constructing equivariant Morse
quasiisometric embeddings of trees into higher rank symmetric spaces.
