thanks, all,
i think source() is the right one i am looking for.

On Sat, Dec 26, 2009 at 3:13 PM, David Winsemius <dwinsemius@comcast.net>wrote:

>
> On Dec 26, 2009, at 3:10 PM, Wensui Liu wrote:
>
>  i am just wondering if there is an effective way to include other external
>> codes into the program.
>>
>>
> ?source
>
>>
>>  --
>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
>


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