Thanks to Grant, Tamas, Byron and Olin for your responses and adding to 
my knowledge of what I can do and should do.  Your explanations really 
added depth to my understanding.

Bo

<snip>
>
> The ".inc" file associated with the chip will define W = 0 and F = 1 so you
> can use these letters instead of the numbers which just makes it a bit
> easier to remember. ie:
>
> ADDWF     val, F
>
> will add the contents of W with the contents of the file register "val" and
> put the result in "val" whereas
>
> ADDWF     val, W
>
> will do the same but put the result in the W register.
>
> If you don't put either W or F the assembler will give a warning ("Using
> default destination of 1 (file)") and default to the F registe
>   
> <snip>
>   
>> Bo Dirigo wrote:
>>     
<snip>
>> My question is "Do you need to specify the "0" value if one knows they
>> want the resultant value to be stored in the W register?"
<snip>

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