Written by a student at the Clausthal University of Technology in the REXX scripting language, it drew a crude Christmas tree as text graphics, then sent itself to each entry in the target's email contacts file.
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Its core mechanism was essentially the same as the ILOVEYOU worm of 2000 - although running on mainframes rather than PCs, spreading over a different network, and scripted using REXX rather than VBScript.
Lastly, part 3 is more tedious and may involve multiple programming challenges such as COBOL, REXX, JCL, etc. (depending on the questions set for the year's challenge).
The syntax and object model of NetRexx differ from Object REXX, another IBM object-oriented variant of REXX which has been released as open source software.
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The successor ooREXX shares a few syntactical elements (LOOP, DO OVER) not found in classical REXX.