AMOSi:Arexx$

an example can be found on AMOSPro_Examples:Examples/H-8/Help_84.AMOS

After a message has been successfully received from an AREXX compatible program, you can read it's contents with the AREXX$ function.

message$=Arexx$(arg_number)

arg_number is the number of the argument you wish to read, ranging from 0 to 15. If it's not included, you'll get an empty string "".