use subst to map a drive at startup

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From: russ (russ_at_appl.com.au)
Date: 07/29/04 

Date: Thu, 29 Jul 2004 15:46:04 -0700

Hi XP gurus,

can someone please tell me how to (or rather where to)
place the line
subst m: "e:\my documents\my music"
(or WinXP equivalent)
so that it is implemented each time I boot the PC

Thanks in advance