XrefIT Cross Reference System requires:
ChangefIT v2.31 or higher.
XrefIT v1.27: IBM i v6.1 or higher.
XrefIT v1.24 to v1.26: OS/i5 v5r3 or higher.
XrefIT v1.21 to v1.23 (free versions): OS/i5 v5r3 or higher.
27x132 "green-screen" 5250 display format capabilities.
Please note the end of programming support dates below (other support is still available):
IBM i v6.1 ceases on 31 December 2016.
IBM OS/i5 v5r4 ceases on 01 January 2015.
IBM OS/i5 v5r3 ceased on 01 January 2014.