Search ('all' for everything):

Search results:
&allocated — cumulative allocation
&clock — time of day
&collections — garbage collections
&date — date
&dateline — date and time of day
&dump — set termination dump
&error — set error conversion
&errornumber — number of last error
&errortext — description of last error
&errorvalue — value causing last error
&features — implementation features
&file — source file
&host — host system
&level — procedure level
&null — null value
&progname — program name
&regions — storage regions
&storage — storage utilization
&time — elapsed time
&version — Icon version
args — get number of procedure arguments
collect — perform garbage collection
copy — copy value
delay — delay execution
display — display co-expression variables
errorclear — clear error indication
exit — exit program
function — generate function names
getenv — get value of environment variable
loadfunc — load external function
name — produce name
proc — convert to procedure
runerr — terminate with run-time error
serial — produce serial number
stop — stop execution
system — call system function
type — produce type name
variable — produce variable
x(x,…) — function call

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