I got a letter, and there is such abstract:
Attached is also instructions on how to put your products in the store. Even if you are formillar with xcart please read these incase we do things a lil different.
Let me know if you have any ?. And please just make sureall your skus start off the same... only changing the last #s
that is how i do payroll, so if the skus change or differ, i might miss them. 
I think I understand it but I am not sure whether I am right. I am concerned about the underlined part.
what are skus? codes?
Thank you in advance!