Precompiled libraries containing MDL classes, parameter types, and functions can be stored into separate libraries which can be dynamically loaded on demand during runtime of the simulator. Analogous to the #include file lookup strategy an environment variable (VLIBRARYPATH) specifies the search path for such libraries:
set $VLIBRARYPATH = ".:$VPROJECT/lib/";
LoadObjectLibrary "prnt-parameters";
LoadObjectLibrary "prnt-models";