http://ww1.microchip.com/downloads/e...Doc/30277d.pdf

Forgot to add... if RB6 and RB& is connected to your LCD, it should have no affect as LCD's have minimum pin loading, so isolation will probably not be required (depending on how good your programmer is)... try it and see. I generally try to assign control buttons to RB6/7 so that they're out of circuit (normally open-circuit with internal pull-up's) and don't interfere with ICSP.

Personally, I isolate Vdd from my PCB's +5v supply with a Diode and Capacitor to Vss (and have only the PIC powered via the ICSP connector when programming. It goes without saying that you will have to Diode isolate MCLR as well.

Melanie