Hello, elegantmachine
I see you have not yet marked your question as "Answered," so you may be waiting for some other alternatives. Here are some other suggestions for your consideration.
Is it possible to activate iSight remotely, let's say... from work? ... How?
Apple Remote Desktop can give complete control your Mac, including iSight, remotely:
http://store.apple.com/us/product/MB422Z/A
The documentation that comes with it (and its
Help) have the answers to your "How" questions.
And: If i want to stream iSight, like a ordinary webcamera, with an ip to access, which is the best way of doing it?
One of the streaming or webcam apps from this list will meet your needs:
http://discussions.apple.com/thread.jspa?threadID=2013310
Evocam is widely used and has good documentation for first-time streaming webcam users.
Apple's pro-level QuickTime Broadcaster/Streaming Server will
certainly do what you ask, but, unless you are familiar with it, you may not want to do the study needed to get it working - unless you need some special part of its vast capability. (Probably not necessary for "Kitty." 😉 )
If your needs are simple enough, you might even be satisfied with some simpler, browser based method like Yahoo! Messenger's rudimentary web-cam function.
If you do not need long-term, reliable, operation, perhaps easiest of all is to use a web based chat room like possible with
http://www.mebeam.com or
http://www.tokbox.com Using something like this, although Kitty will not be much of a chat partner, it should be possible to set up a "chat" from home, then go somewhere else, and log into the chat room you have established.
Take a look at the list and decide based on the functions you need versus the ease of use you want.
EZ Jim
G5 DP 1.8GHz w/Mac OS X (10.5.7) PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight