Shell
The shell apps can be found under Pinned Apps or on the top navbar under the Tools section. There are two different shells.
The Login node shell launches a normal Linux shell on one of the login nodes. Any command that is running when the login node shell browser tab is closed will stop. Note that the same rules apply here as during a normal SSH session:
Error-label
Login nodes are only for light pre/postprocessing (see usage policy).
The Compute node shell launches a persistent shell on a compute node for heavier commands that should not be run on login nodes. The persistent shell will keep running even if you close your browser or lose internet connection.