This system extension allows you to send short text messages from applications supporting the "Send..." command, for example the built-in Contacts, Memos, Calendar, Tasks. Compatibility
Tested on Treo 600 and Treo 650. Should work on Treo 700p as well Theoretically, it can also send SMS on other devices if there is an SMS-handling application registered in the system. Usage

• Select "Send..." from the menu
• Select "SMS"
• The text is pasted into the message, now you can fill in the "To:" field and click Send

Limitations

• It can only send Text, exactly like if you typed it yourself. The receiver will also get the data as text only. For Memos this is obviously not a problem. For Contacts, Calendar events, and Tasks you can use RNS:: TreoVCardReceiver to automatically transfer the incoming data into the associated application.
• The amount of text is limited by the medium, you cannot send more than a few hundreds of characters.
• And of course no binary data (it would be hard to find the binary file to match the size limit anyway).

What about the built-in Messaging/MMS?
On the Treo 600 you can send this kind of data with the built-in MMS application (call "Send", pick "MMS") - but there is no option to select SMS instead of MMS. On Treo 650 it is called "Messaging" instead of MMS and it is even worse (all you get is: "The messaging application does not support this type of item.").