> To let you know: There is a customer who is making many tests with a 
> device
> of us and therefore we constantly have to send re-programmed PICs. So my
> thought was to give him a PicStart+ and a simple utility to let him
> re-program the PICs by himself, only by sending a new hex file to him. I
> don't want to let him install a complete MPLAB for I know, that he will 
> make
> many "strange things" for he is somewhat technophobic....

If that is the case then you really need an encrypted bootloader, as the 
customer could just as easily obtain a copy of MPLAB directly from 
Microchip, and look at the hex file with it. 

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