We highly recommend using the current version of the Swarm City DApp at https://swarm.city to create new accounts.
Swarm City version 1 was our first draft and is now considered extinct. However, it is still accessible for those who need to use the ARC to SWT conversion tool until we relocate this feature. This version currently has numerous known bugs and issues, and is not being further developed.
Swarm City developers scrapped version 1 and rebuilt a new and improved version 2 that requires their full attention. Please use version 2 at https://swarm.city for optimal DApp performance.
Yes, multiple people can respond to an offer, but you will choose which one you prefer to interact with. Once a peer is selected, a direct communication link is established and remains open for the duration of the transaction.