HTC Desire Z User Manual page 210

10 More apps
When your friends see the link in your sent message, email, or status update, they can
simply tap the link to go directly to the game or app in Android Market to download it.
While entering your status update in Friend Stream, you can also tap

games or apps that you want to share in your social networks.
If you've already created a new text or email message, press MENU and then tap Attach >

App recommendation to choose from your list of installed games and apps.
to choose from