The MaxL Shell (essmsh) is a pre-parser mechanism for entering MaxL statements.
Start the shell to be used interactively, to read input from a file, or to read stream-oriented input (standard input from another process). You can log in after you start the shell, interactively or using a login statement in the input file. You can also log in at invocation time, by using the -l flag (see -l Flag: Login).