1. Transaction code AL11 is used to display all the SAP Directories. We can access the different file systems that have been defined and attached to a Parameter. In this transaction we can view a file, find files under a directory. Few important directory parameters are DIR_CT_RUN, DIR_DB2_HOME, DIR_DATA, DIR_EXECUTABLE, DIR_TRANS.
2. When you double click on a directory, you will see all the files in the directory. Using the directory parameters in the profile or in program, we can call a file from the OS level in SAPGUI on the user PC/Laptop.