string absolute_from_relative( string path );
void cd_command( string parameters, StreamOutput* stream );
void play_command( string parameters, StreamOutput* stream );
void progress_command( string parameters, StreamOutput* stream );
void abort_command( string parameters, StreamOutput* stream );
string absolute_from_relative( string path );
void cd_command( string parameters, StreamOutput* stream );
void play_command( string parameters, StreamOutput* stream );
void progress_command( string parameters, StreamOutput* stream );
void abort_command( string parameters, StreamOutput* stream );