call calls a subroutine within a program.

else denotes start of alternative clause for IF.

endif marks end of conditional commands.

endsub marks end of subroutine definition.

exitloop exits from current loop.

for start of FOR execution loop.

if conditional execution statement.

include include subroutine in programs.

next end of FOR loop.

return exit subroutine.

sleep pause program.

step (optional) step size of a FOR loop.

stop halts execution of program.

subroutine declares subroutine.

then part of IF statement.

to upper limit of FOR loop.

wend end of WHILE loop.

while start of WHILE loop.