CASE SENSITIVE

When matching a string of letters ,it is case sensetive if capital and lower case letters must matched exactly .If an operating system or a piece of software is case sensetive ,it will see all of the following text strings as differentCOMMON,Common,common,CommoN . On the web and internet ,basic addresses are never case sensetive ,but paths and filenames my be,depending on the operating system.Here, basic addresses mean domain addresses.