The screen captures seem to be pulled from
this archived snapshot dating back from March 2009 (there is a
prior archived version from January 2009, but the images don’t show).
The related comments alongside the release (see the above links) are an interesting read, and further clarify how sending to an IP worked:
<…> If the recipient is online, you can enter their IP address and it will connect, get a new public key and send the transaction with comments. <…>
Another comment that caught my attention is this one:
Generated coins must wait 120 blocks to mature before they can be spent.