If you like to send cards but you really like to send them on the computer, a great site is www.123greetings.com
You can choose a card you want. You have enter your email address and that of your friend who you are going to send it to. After you fill out the information, you can send it. It gives you the option of getting notification of when they open up the card. There are some very pretty ones on this site. Click here for a sample.
When you click on the link it will take you to a page and the card will load. When it is loaded, it will tell you "play". Click on that. There will be other things to click on since this card is interactive. It has music, too.
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