Dilema over, I now have the routine working as expected

My VFP code looks like:

lnReturnCode = SQLExec(lnConnectionID, 'exec Candidate_Insert_Blank ?1000000001, ?@lnCandidateID', '')

My SQL Server code looks like:

ALTER procedure [dbo].[Candidate_Insert_Blank] (@CreatedByID int, @lnCandidateID int output)

as
begin
set nocount on;
insert into Candidate (CreatedByID)
values (@CreatedByID)
set @lnCandidateID = scope_identity()
end