Thanks for the clues, Charles.

However, I am still a little bit confused. For example, suppose I change to a 16F676, which the data sheet says has "1024 Flash Words" of program space. Do these WORDS equate with the WORDS given by Microcode Studio?

It is a pity that this is not properly explained in any of the MCS or PBP documentation and that MCS (or my MEL chip programmer) does not give the % space remaining or used in the device selected.