CASE-SENSITIVE-VOC CASE CASE_MAGIC
CASE-SENSITIVE-VOC ( -- )  
<FORTH-83>
accesses CONTEXT which is generally the last named VOCABULARY . sets a flag in the vocabulary-definition so that words are matched case-sensitive. 
 example: 
    VOCABULARY MY-VOC  MY-VOC CASE-SENSITIVE-VOC

reference: p4_case_sensitive_voc in ../src/forth-83.c:0109, export CO CASE-SENSITIVE-VOC