[tex-live] Can I change the postscript font that is assigned to a TeX font?

[Mark London]

I'm presently using URW Arial for Arial, but it's not quite real Arial.
Is there a way to use the present URW Arial, but change a map file somewhere 
so that the postscript font which is used, is ArialMT instead? 

I do something sort of like this for Bluesky Tex on the mac.  Bluesky only 
contains helvetica, but helvetica is extremely close to arial.  And in Bluesky 
Tex, it's possible to change the name of the postscript font assigned to a 
font.  I.e. for Helvetica, I changed it's postscript font to be ArialMT.

Then I run Adobe distiller, and the PDF looks great.  All I mainly care about 
is getting PDF output, fwiw, so maybe a texpdf map file can be changed instead?

(I'm trying to avoid the previous suggestion of installing the Vietnamese font 
in order to get Arial, if possible!)

Thanks. - Mark