The file Common/Environ.fth provides the ANS Forth word
ENVIRONMENT?
, and some basic environment data.
Vocabulary Environment \ used for enviroment? queries
The vocabulary within which environment data is kept.
: ENVIRONMENT? \ c-addr u -- false | i*x true
The string is treated as a word name. If it is found
in the ENVIRONMENT
vocabulary, the word is executed,
the results of executing it plus true are returned,
otherwise just false is returned.