Card tricks
A deck is loaded whole into the WAP browser on each fetch. Small screens clutter easily and constant scrolling is annoying.
Cards help reduce clutter. One can put variants of the same info or form on different cards. Say, imperial or metric units on a weather forecast.
Cards in a deck should be closely related or they may be hard to navigate through.
Card: One part of a WML deck that is displayed at a time. Switching between cards in a deck is fast because the whole deck is already loaded.
Deck: A series of cards stored in a single .wml file.
Form: a series of related inputs you (the user) need to fill to send data to the web server. The form itself will explain what info is required.