A REXX language program requires an intermediate routine to translate from the string format used within REXX programs to the binary format used by the EZAFTPKS program. An external function package is provided that serves as this intermediary, facilitating calling the FTP client API from a REXX language program.

The FTP client API for REXX is included as a default system function package, and is included in the default parameter modules IRXTSPRM, IRXISPRM, and IRXPARMS.

The FTP client API for REXX might run in additional environments, but it has not been tested and verified to work in other environments.