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Task/Special-variables/Icon/special-variables.icon

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+# &keyword # type returned(indicators) - brief description
+# indicators:
+#    * - generates multiple values
+#    = - modifiable
+#    ? - may fail (e.g. status inquiry)
+#    U - Unicon
+#    G - Icon or Unicon with Graphics
+#
+&allocated   # integer(*) - report memory allocated in total and by storage regions
+&ascii       # cset -  ASCII character set
+&clock       # string - time of day
+&col         # integer(=G) - column location of pointer
+&collections # integer(*) - garbage collection activity in total and by storage region
+&column      # integer(U) - source code column
+&control     # null(?G) - control key state
+&cset        # cset - universal character set
+&current     # co-expression - current co-expression
+&date        # string - today's date
+&dateline    # string - time stamp
+&digits      # cset - digit characters
+&dump        # integer(=) - termination dump
+&e           # real - natural log e
+&error       # integer(=) - enable/disable error conversion/fail on error
+&errno       # integer(?) - variable containing error number from previous posix command
+&errornumber # integer(?) - error number of last error converted to failure
+&errortext   # string(?) - error message of last error converted to failure
+&errorvalue  # any(?) - erroneous value of last error converted to failure
+&errout      # file - standard error file
+&eventcode   # integer(=U) - program execution event in monitored program
+&eventsource # co-expression(=U) - source of events in monitoring program
+&eventvalue  # any(=U) - value from event in monitored program
+&fail        # none - always fails
+&features    # string(*) - identifying features in this version of Icon/Unicon
+&file        # string -  current source file
+&host        # string - host machine name
+&input       # file - standard input file
+&interval    # integer(G) - time between input events
+&lcase       # cset - lowercase letters
+&ldrag       # integer(G) - left button drag
+&letters     # cset - letters
+&level       # integer - call depth
+&line        # integer - current source line number
+&lpress      # integer(G) - left button press
+&lrelease    # integer(G) - left button release
+&main        # co-expression - main task
+&mdrag       # integer(G) - middle button drag
+&meta        # null(?G) - meta key state
+&mpress      # integer(G) - middle button press
+&mrelease    # integer(G) - middle button release
+&now         # integer(U) - current time
+&null        # null - null value
+&output      # file - standard output file
+&pick        # string (U) - variable containing the result of 3D selection
+&phi         # real - golden ratio
+&pos         # integer(=) - string scanning position
+&progname    # string(=) - program name
+&random      # integer(=) - random number seed
+&rdrag       # integer(G) - right button drag
+&regions     # integer(*) - region sizes
+&resize      # integer(G) - window resize
+&row         # integer(=G) - row location of pointer
+&rpress      # integer(G) - right button press
+&rrelease    # integer(G) - right button release
+&shift       # null(?G) - shift key state
+&source      # co-expression - invoking co-expression
+&storage     # integer(*) - memory in use in each region
+&subject     # string - string scanning subject
+&syserr      # integer - halt on system error
+&time        # integer(=) - elapsed time in milliseconds
+&trace       # integer(=) - trace program
+&ucase       # cset - upper case letters
+&version     # string - version
+&window      # window(=G) - the current graphics rendering window
+&x           # integer(=G) - pointer horizontal position
+&y           # integer(=G) - pointer vertical position
+# keywords may also fail if the corresponding feature is not present.
+# Other variants of Icon (e.g. MT-Icon) will have different mixes of keywords.