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&errout — standard error output
&input — standard input
&output — standard output
chdir — change directory
close — close file
digitcnt — count the number of digits in a file.
flush — flush output
open — open file
read — read line
reads — read string
remove — remove file
rename — rename file
seek — seek to position in file
stop — stop execution
where — produce position in file
write — write line
writes — write string

Index of Function Types:
affects &pos
character sets
co-expressions
control structures
file processing
generators
infix operations
keywords
lists, sets and tables
math
metadata
output formatting
pattern matching
prefix operations
records
strings
windows and keyboards

Index of Subsystems:
base
digitcnt.icn
SNOBOL4 functions