This is an update of the original open source version of CMMT/XOMT as released to the IDMS user community by Neon Systems. It includes updates to support release 17 &18 (and some 16 fixes too) and also addresses some issues with the original assembly/install jobs. It is also distributed as XMIT files rather than individual members to make it easier to upload to your mainframe. Finally I’ve produced a document to describe in more detail the steps required to assemble and install the product. Note that this does include all of the updates supplied by John Fisher's 3.18A update.