HP 39g+ - Manual (Page 227)

Programming 16-17
View numbers
The Function aplet views are numbered as follows:
UNCHECK Unchecks (unselects) the corresponding function in the
current aplet. For example, Uncheck 3 would uncheck F3
if the current aplet is Function.
UNCHECK n:
Branch commands
Branch commands let a program make a decision based
on the result of one or more tests. Unlike the other
programming commands, the branch commands work in
logical groups. Therefore, the commands are described
together rather than each independently.
IF...THEN...END Executes a sequence of commands in the true-clause only
if the test-clause evaluates to true. Its syntax is:
IF test-clause
THEN true-clause END
Example
1 X A
:
IF A==1
THEN MSGBOX " A EQUALS 1"
:
END
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