Program Flow Control

ABORT: Terminates all programs and returns to the command level.
BEGIN CASE: Indicates the beginning of a set of CASE statements.
CALL: Executes an external subroutine.
CASE: Alters program flow based on the results returned by expressions.
CHAIN: Terminates a BASIC program and executes a command.
CONTINUE: Transfers control to the next logical iteration of a loop.
END: Indicates the end of a program or a block of statements.
END CASE: Indicates the end of a set of CASE statements.
ENTER: Executes an external subroutine.
EXECUTE: Executes sentences and paragraphs from within the BASIC program.
EXIT: Quits execution of a LOOP...REPEAT loop and branches to the statement following the REPEAT statement.
FOR: Allows a series of instructions to be performed in a loop a given number of times.
GOSUB: Branches to and returns from an internal subroutine.
GOTO: Branches unconditionally to a specified statement within the program or subroutine.
IF: Determines program flow based on the evaluation of an expression.
LOOP: Repeatedly executes a sequence of statements under specified conditions.
NEXT: Defines the end of a FOR...NEXT loop.
ON: Transfers program control to a specified internal subroutine or to a specified statement, under specified conditions.
PERFORM: Executes a specified sentence, paragraph, menu, or command from within the BASIC program, and then returns execution to the statement following the PERFORM statement.
REPEAT: Repeatedly executes a sequence of statements under specified conditions.
RETURN: Transfers program control from an internal or external subroutine back to the calling program.
RETURN (value): Returns a value from a user-written function.
STOP: Terminates the current program.
SUBR( ): Returns the value of an external subroutine.
WHILE...UNTIL: Provides conditions under which the LOOP...REPEAT statement or FOR...NEXT statement terminates.