Question: Customer wants to use the BOOT.OBJ out of the RTS30.LIB and wants it to be located at 0x40.

Answer: Extract BOOT.ASM from the RTS.SRC, change the section and then reassemble it into an object file. So long as this object is linked first, it will replace the original BOOT.OBJ from the library. Eventually he can rebuild the library if he wishes.