Use the New command to create a new Labbook or Worksheet. Labbooks are used to organize your work. They appear as subdirectories in the file system. Labbook names can contain up to 8 alphanumeric characters. Labbook names cannot contain spaces. You cannot create a Labbook with a name of a directory which already exists in the current directory. Worksheets store your analysis. Worksheet names can contain up to 15 alphanumeric characters. Worksheet names cannot contain spaces. Labbook and Worksheet names are case sensitive.