You can contact me with a note. From your terminal (connected to SDF!) type notes -s, specify that it's for me (chr) and type your message. It's like this (what you have to type is in bold):

$ notes -s
For whom? chr
[END input with CTRL/D or ABORT with CTRL/C]
Hi there!
From $USER on 17-Oct-09 13:25:54
Hi there!

SEND notification to chr? (y/n) YES

The domain is Append chr to it.