Desktop Icon Actions can be referenced via their Alias as follows: 

Special return values of Desktop Icon Actions
replica_existsbool"1" if a local replica has been found
replica_is_stubbool"1" if replica does not contain any views
replica_is_beyond_cutoffbool"1" if replica has not been replicated within the cutoff interval
replica_is_incompletebool"1" if replica has been determined to be incomplete by the completeness check. The option
has to be enabled in the icon action for this check to run. Will contain "0" if option is disabled.
replica_typestring"none" - replica_exists == "0"
"stub" - replica_is_stub == "1"
"incomplete" - replica_is_incomplete == "1"
"full" - replica exists and is neither a stub nor incomplete
replica_pathpathThe current path of the local replica. Can contain relative paths. Not returned at all if no replica found
replica_movedbool"1" if replica has been moved (due to enforce local replica path option in action)
replica_path_previouspathWhere the replica was before we moved it. Can contain relative paths.
Not returned at all if no replica found or replica not moved