Hints for finding products when you know the serial number:

in the Cactus program, do   file | return.  Then if you want to find the item ...

In the RMA file:

"use returns"

"list for "xxxxx" $ r_serial" where "xxxxx" is a partial serial number. (I tend to avoid 0's and O's, and any other character that can be easily mistaken, like "5", "Z" and "2".)

in the serial number file (keeps a record of products we buy):

use serial

list for "xxxxx" $ s_number

in the sdetail (keeps a record of products we sell):

use sdetail

list for "xxxxx" $ s_number