* GOPROC <line descriptor>[,<variable list>]
Calls the statement <line descriptor>, passing the variables on the
list.  Similar to GOSUB, except it allows the subroutine to have
local variables, which are not affected by assignments outside
the procedure.  Also allows passing variables to the subroutine.
The subroutine need not contain a PROCEDURE statement, which is
only used to declare local (not global) variables.
Examples:    GOPROC SEARCH,STR1$,STR2$,POSITION   GOPROC SORT

GOSUB <line descriptor>[,<variable list>]
A subroutine call is made to the line indicated.  That is,
execution continues at <line descriptor> until a RETURN statement
is encountered, at which time execution is continued at the
statement following the GOSUB statement.  Variables on the
optional <variable list> are passed to the subroutine on the
control stack, and may be picked up by a RECEIVE statement,
in the same way that they are in a GOPROC operation.
Examples:  GOSUB CALC,X,A$    GOSUB 10570    GOSUB GET+1

GOTO <line descriptor>
An unconditional branch is made to the line indicated.  That is,
execution continues at <line descriptor> instead of the next
statement.  Examples:  GOTO 100    GOTO LOOP+2    GOTO LAST-5

* IF <logical expression> GOTO <line descriptor>
If the value of <logical expression> = -1, then execution
continues at the line indicated.  Otherwise, execution continues
with the line following the IF statement.  The logical connectives
allowed in <logical expression> are:  AND, OR, NOT, >, <, = .
See Appendix B for explanation of logical expressions.
Examples:  IF X<128 AND X>31 GOTO EXTRA    IF STR$<>"NO" GOTO 100

* IF <logical expression> THEN <statement> [ELSE <statement>]
If the value of <logical expression> = -1 (true), then the first
<statement> is executed.  Otherwise, it is not.  If the ELSE option is
used, the second statement is executed if the value of <logical
expression> is false.  See Appendix B for def. of logical expression.
Examples:  IF ANS$="YES" THEN GOSUB INSTR        IF 3*Y=4 THEN PRINT "OK"
	   IF ARRAY(N)=0 THEN GOTO LOOP ELSE STOP

INPUT ["<string>"];<variable list>
Assigns entries from the INPUT (logical unit #0) device to the
variables on the list.  Prompts may be included by enclosing a
string in quotes, separated from the variables by semicolons.
With no prompt, a "?" is printed.  A carriage return must be
used to terminate string input.  If a carriage return alone is
entered, the variable is set to a null for strings or to a zero
for numbers.  If a number is entered in "e" format, be sure to
put a sign or a space after the E, then two digits.
Examples:  INPUT A,B$    INPUT "FILENAME";NAM$

KILL <string expression>
Deletes symbol of name <string expression>.  This is used when
a variable is not required for the rest of the program, and it
is desired to conserve memory space.
Examples:  KILL "X$"    KILL "QTY"   KILL VARNAM$

[LET] <variable name>=<expression>
Assigns the value of <expression> to <variable name>.  The word
"LET" is optional.  Examples:  LET X$=Y$+Z$    LET INDEX=5  X=2+2

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