BrightSign BrightScript 3.0 Reference Manual - Manual (Page 50)

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End Function
“m” Identifier
If a function is called from an associative array, then the local variable
m is set to the associative array in which the
function is stored. If the function is not called from an associative array, then its m variable is set to an associative array
that is global to the module and persists across calls.
The
m identifier should only be used for the purpose stated above: We do not recommend using m as a general-purpose
identifier.
Example:
sub main()
obj={
add: add
a: 5
b: 10
}
obj.add()
print obj.result
end sub
function add() As void
m.result=m.a+m.b
end function