I'm not sure if this applies, but check AN656 from microchip.

>Date:         Fri, 16 Jan 1998 01:06:37 -0300
>Reply-To:     pic microcontroller discussion list
<PICLIST@MITVMA.MIT.EDU>
>From:         Javier <grijalba@CVTCI.COM.AR>
>Subject:      PIC to blow another PIC
>To:           PICLIST@MITVMA.MIT.EDU
>
>Hi has anybody  on the list information of how to build a handheld PIC
>programmer
>or use a PIC to program another PIC ??
>Thanks in advance
>Javier
>


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