>I have a .dll running inside MTS fine. Now I want to make it DCOM-callable. If it was an out-of-proc .exe it would already show in DCOMCNFG. How to get my MTS dll viewable in DCOMCNFG?

If you have it running under MTS, by default, it is now an out-of-proc server. Unless I misunderstand the concept behind MTS (and that could be true).

Configure the security under MTS and use CREATEOBJECTEX({guid},'\\Servername') where \\Servername is the name of your MTS box. I believe that will work (although running NT Workstation right now, I can't test it).

Good luck!