baka to provide a little isolation sa VDD ng supply circuit ng board at VDD ng PICKIT2. Pero kahit wala na, magwowowrk naman. kung lalagyan, siguro around 33ohms wont hurt.
to avoid confusion, eto nalang:
PGD and PGC varies depende sa chip. refer to the datasheet of the target PIC.
typically, RB7 and RB6 are PGD and PGC, respectively.
the resistors by the label "to application circuit" could be a value around 1kohms. this is to provide isolation from the circuit during programming. pero depende pa din sa application. siguro kakailanganin ang special na isolation circuit kapag sensitive.