If one goes to the Royal Mail website, there is a page that tells you lots of information about their tracking service. There is also a page where one can input the tracking number from one's parcel, and find out where it is.
To check the tracking of US mail you can go to post office you used and type in the tracking number they gave you. If you did it with a company like FedEx you can go to their website and type in the number.
The United Parcel Service offer a few tracking options which include tracking by e-mail, tracking by reference, better visibility, history of your past tracking numbers and some enhanced tracking features which can be found on their webpage.
Unfortunately, there is no way to track a package if you did not receive a tracking number. A tracking number is needed in order to know if mail has shipped, to get this number you need to ship certified mail.
USPS Priority Mail is when your package or letter is delivered within 48 hours. USPS will pick the package up at your house for free and you'll be given a tracking number.
International Express Mail Service
It is an alternative for International EMS mail service that provides limited tracking information.
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"Prefix CW" in a USPS tracking number indicates that the package was shipped using a USPS service called "USPS Priority Mail Express International." This service provides fast international delivery with tracking and insurance included.
You can't. The only tracked mail is if you pay extra to have a tracking number on it.
If you need to track a package from USPS but you do not have a tracking number you can call the branch of the USPS that services your home and ask the customer service agent. They will gladly furnish you with any information they may have on your package.
Royal Mail have typically come under fire the last few years especially since their split away from the Post Office. Despite TNT taking some business away from Royal Mail they maintain a loyal fan base and their tracking service is reliable and reasonably priced.