[Scip] Question about the number of nodes processed

[Alexander Schnell]

Dear SCIP team, 

I have a question about the difference between the functions
SCIPgetNNodes(...) and SCIPgetNTotalNodes(...) which give 
the total number of nodes processed in the current run and in all runs. 

What does a run mean or in which situations are the outputs of the above
functions different?
In concrete, is there a difference when the solution process is
restarted more than once (i.e. does SCIPgetNNodes(...) only output the
number of nodes processed after the last restart)? 

Best, Alex.