It will do what you want with the conversion from "69" to 69.

The concatanation operators are "|", "||", " ", "'", and '"'. Depending on how they're used, they can mean concatanate with our without a space: for example "Bill"'"The Cat" will produce "BillThe Cat". "Bill" "The Cat" will produce "Bill The Cat". The pipes are a little bit different: one pipe produces a space, two pipes mean no space.

A "function pointer" doesn't exist in rexx, unless I misunderstand what you mean by it. There are no pointers in rexx.