Backing up a step...

In VFP, there is no difference defining a procedure or function. The following examples are identical.

PROCEDURE SomeSubRoutine
LPARAMETERS One, Two
Three = One + Two
RETURN Three
END PROC

FUNCTION SomeOtherSubRoutine
LPARAMETERS One Two
Three = One + Two
RETURN Three
END FUNC

The difference is in how you call them. This first example is calling as a procedure

a = 1
b = 2
DO SomeOtherSubRoutine WITH a, b

No value will be returned
by default, a and b will be passed by reference. To pass a by value:

DO SomeOtherSubRoutine WITH (a), b

This example is calling as a function

c = 1
d = 2
e = SomeSubRoutine(c, d)

A value will be returned
by default, c and d will be passed by value. To pass c by reference

e = SomeSubRoutine(@c, d)

>Hi,
>
>Specifically I mean, as far as the title, what is the purpose of the "L" in LPARAMETERS. I understand it means "local" but the following example shows that it is not quite local:
>
>

>LOCAL lVar1, lVar2
>
>STORE 1 TO  lVar1, lVar2
>
>=TestFunct( lVar1, @lVar2 )
>
>? lVar1, lVar2
>
>FUNCTION TestFunct
>LPARAMETERS lVar1, lVar2
>
>lVar2 = 122
>
>RETURN
>

>
>Or does it mean that the "@" overrides the L in LPARAMETERS?