You'd need to hope there's someone out there who uses this dll, which I've never heard of. A dll is like a collection of 1-or-more identifiers or commands wrapped up inside an external binary. Hopefully you have some documentation telling you which procedure names are inside the dll, and hopefully the docs tell you the syntax of how to use them.
The procedures inside the dll are similar to alias names inside the dll which can do things a scripted alias can't do by itself, and the procedures need to be called in their exact case-sensitive name. You can call them like a command, as in:
/dll filename.dll procedurename this is the $1- for the procedure
or
//echo -a $dll(filename.dll,procedurename,this is the $1- for the procedure)
We'll have a hard time helping you when your problem is that, not only are you not feeding the $1- to the dll's procedure, you're not even passing the name of the procedure either.
edit: if you have trouble figuring out that dll, perhaps better luck with spopup.dll
http://www.xise.nl/mirc/
