One may assign variable CLASS_PATH in Configuration file. This variable contains path(s) to classes' directory (directories). If path to a module is relative, the module will be search for in CLASS_PATH (if CLASS_PATH is a table, rows with paths will be iterated through from bottom to top).
Example of table CLASS_PATH:
$CLASS_PATH[^table::create{path
/classes/common
/classes/specific
}]
In this case, relative path my/class.p will be searched for as: