The VLisp[Ins96] interpreter used in the VISTA project was strongly influenced by the LISP interpreter XLISP[Bet89] from D. Betz which is freely available for non commercial use and written in C. This interpreter is also the base for WINTERP[May90]. The base functionality it mostly compatible with COMMON LISP[Win89, Dra94], but implements an own object system. The VLisp interpreter is written as a library with the symbolicName VLisp-Library. One additional object file with the symbolicName VLisp-Main-Object is required for the main startup routine. To form a full VLisp interpreter with the VLisp-Program (see VLisp-Program) a command line interface definition is required and optional TAC bindings can be added.