http://www.vmworkshop.org/HENSLER/ includes my MAILABLE EXEC, which uses this technique to create self-extracting blobs wrapped in Rexx code to unpack them. Alas, it's VM-only, but it illustrates the idea.
This was useful back in the era when folks had a lot of problems getting EBCDIC objects (especially executables) sent via email; less so nowadays, when most people have VMARC. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN