HTC Droid Eris :: When Do Apps Check For Updates?

This morning I power cycled my Eris for for first time in a week or so. After that, the notificaton area said I have four updates waiting.I think I selected the "My Tracks" app for update, but when I did, it told me to make sure I had at least 40% battery charge, the phone would be unusable during the update, etc., and it proceeded to install the OTA update to build 1.17.605.1.That's fine, but now the phone doesn't show any apps with available updates.Will these apps automatically notify me again that updates are available? Do all apps routinely check?