An Object Oriented Database Management System (OODBMS) provides a query language that allows end users to define and manipulate database interactively. Besides, it must have host language interfaces for embedding query statements in C, FORTRAN, PASCAL or other languages. This paper presents the implementation of such ahost language interface -C-OSDL. In particular, the authors focus on the algorithms to translate C-OSDL commands into SoL statements and a method to manage cursor hierarchy for navigational re