====== Gosub ======

The Gosub command will instruct the current program to call to a specified label. 

<code xbasic>
Gosub LAB1
:

LAB1:
  I = 3
  Return
</code>

==== About Labels… ====

A label can be set with a colon (:) to specify a point for GoTo or GoSub to begin execution.

    ADD_VALUE:
    LINKPOINT:
        
Labels cannot use reserved keywords, numbers, or include blank spaces.

The following labels are not permitted:

    Ladder:         'Reserved keyword
    123:            'Number.
    About 10:       'Blank space.


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