In Windows systems, after installation, R can simply be started by clicking on the R icon. In Linux systems, R can be started by typing "R" at the prompt. You can also specify which directory you want R to start. In windows, right click on the R icon in the desktop and select "properties". In the properties box, type the specific directory where you want R to start. In Iinux (and in Windows as well, in the console), type getwd("<put working directory path>"). Replace "put working directory path" with the directory address of your choice.