Work of scaner mostly depends on it's type - SCSI/LPT/USB/..., because TWAIN-interface is supported. Also you can find information about scanners and OS/2 here.
If eComStation PC doesn't work properly (USB troubles / network is slow / can't run with 2 CPUs / applications crash) then make some efforts, analyze the problems and setup the system. eCSFAQ Frequently asked questions and answers