Go to www.picpoint.com and look at the YAPP pic programmer project.
It does exactly what you are describing.  It uses either a 16F84,
or 16C54 / 16C56 as the "brain" of the box.  It will program
16F84, 16C84, 16C6X, 16C7X devices.  It interfaces with the PC via
an *standard* RS-232 interface.  Mine is in a hand-held sized box.
The web page is in Italian, but the source files and schematic
for the project are commented / written in English.  Just download
the files & open them up!

I hope this helps!

On Fri, 16 Jan 1998 01:06:37 -0300, Javier wrote:

>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
>