Simple Explanation of Twitter

An example Twitter sent to an account name TwitterAccount would look like:
@TwitterAccount Can’t wait to attend. Are there rooms still available? #eventname

The @TwitterAccount would direct it to the TwitterAccount account. #eventname is considered a hash tag and Twitter explains here. The #eventname would let others who search for #eventname find the tweet, but one does not have to always send to someone. So, another Tweet might just use the hash tag:

I’m at #eventname Anyone know a of a good restaurant close to the Event?

or another might look like:

Stop by booth 100 and register to win a prize. Drawing at 4 o’clock #eventname

Regarding the QR codes and url shorteners (sp.), bit.ly or goo.gl, etc… Here we’ll use Bit.ly

They take a url and shorten it, making it easier to enter and or tweet. URL shortening started because Twitter only allowed limited characters. For example, http://www.amplitudedesign.com/web-development/online-marketingcommunications/ when shortened becomes http://bit.ly/nYuFNL. Bit.ly also tracks how many times a bit.ly url is clicked on. Bit.ly can also generate a QR code for every url, which can be displayed by adding .qr to the end of any bit.ly shortened url.

Bit.ly version
http://bit.ly/plUArC

QR Code Version:
http://bit.ly/plUArC.qr

QR Codes are explained on Wikipedia.