Hi Ksenia,
Glad to know about POS module.
I sent email to
pos-beta@x-cart.com
but it returned back as undelivered with following message
We're writing to let you know that the group you tried to contact (pos-beta) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren't able to post:
* You might have spelled or formatted the group name incorrectly.
* The owner of the group may have removed this group.
* You may need to join the group before receiving permission to post.
* This group may not be open to posting.