HelpPC 2.10	Quick Reference Utility	Copyright 1991 David Jurgens
char *strtok( char *str1, const char *str2 )        - prototype in string.h        - parses str1 for tokens and separators, where separators are          defined in str2        - first call returns a pointer to the first character of the first          token in str1 and writes a null character into str1 immediately          following the returned token;   subsequent calls with NULL for          the first argument will work through the string str1 in this way          until no tokens remain        - when tokens are exhausted, returns NULL
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