Per default h ei tml components accept secure messages only. Using the msgallowed parameter you can allow a component to listen for messages as URL parameters. Remember to do so if you really want to use URL based messages. Receivers Components like dbform , dbscroller , dbcontainer and dbdisplay accept messages. The documentation below and the component reference list all messages accepted.
Senders There are various sender components.
When clicked on it sends the message. It works like msglink but includes field values from the panel as parameters. So a dlink can be used to link to another related database record. Additionally there dbquerybutton . Use it on a sesform to send all the form fields as message.