Help is available on the following:

allopen         and             apply           arc             arctan
array           arrayp          arraytolist     ascii           ashift
back            background      backslashedp    beforep         bitand
bitnot          bitor           bitxor          buried          bury
buryall         buryname        butfirst        butfirsts       butlast
bye             cascade         cascade.2       caseignoredp    catch
char            clean           clearscreen     cleartext       close
closeall        combine         contents        continue        copydef
cos             count           crossmap        cursor          define
definedp        dequeue         difference      do.until        do
dribble         edall           edit            edn             edns
edpl            edpls           edps            emptyp          eofp
equalp          erall           erase           erasefile       ern
erns            erpl            erpls           erps            erract
error           exp             fence           filep           fill
filter          find            first           firsts          for
foreach         form            forward         fput            fullscreen
fulltext        gensym          gprop           greaterp        heading
help            hideturtle      home            if              ifelse
iffalse         iftrue          ignore          int             invoke
iseq            item            keyp            label           last
left            lessp           list            listp           listtoarray
ln              load            loadnoisily     local           log10
lowercase       lput            lshift          macroexpand     macrop
make            map             map.se          mdarray         mditem
mdsetitem       member          memberp         minus           modulo
name            namelist        namep           names           nodes
nodribble       norefresh       not             numberp         op
openappend      openread        openupdate      openwrite       or
output          palette         parse           pause           pen
pencolor        pendown         pendownp        penerase        penmode
penpaint        penreverse      pensize         penup           pick
plist           plists          pllist          po              poall
pon             pons            pop             popl            popls
pops            pos             pot             pots            power
pprop           primitivep      print           printdepthlimit printwidthlimit
procedurep      procedures      product         push            queue
quoted          quotient        radarctan       radcos          radsin
random          rawascii        readchar        readchars       reader
readlist        readpos         readword        redefp          reduce
refresh         remainder       remdup          remove          remprop
repcount        repeat          rerandom        reverse         right
round           rseq            run             runparse        runresult
save            savel           scrunch         sentence        setbackground
setcursor       setheading      setitem         setmargins      setpalette
setpen          setpencolor     setpensize      setpos          setread
setreadpos      setscrunch      setwrite        setwritepos     setx
setxy           sety            shell           show            shownp
showturtle      sin             splitscreen     sqrt            standout
startup         step            stop            substringp      sum
test            text            textscreen      thing           throw
to              towards         trace           transfer        type
unbury          unburyall       unburyname      unstep          until
untrace         uppercase       wait            while           window
word            wordp           wrap            writepos        writer
xcor            ycor            .eq             .macro          .maybeoutput
.setbf          .setfirst       .setitem        `               
