Can the executor of the estate demand that certain property be handed over to him/her?
Yes! He can do so, as if acting instead of the deceased.
Can the executor of the estate demand that debts owed to the deceased reach his hands?
Yes! He acts in the place of the deceased on this.
Can an heir deduct any debt he/she owes the deceased from the inheritance share what he/she is due to get from the estate?
Where there is a single heir, this is possible, but if the heir owes money to other creditors, this is likely to lead to an undesirable situation of that heir being favoured over others, and so it will not be possible.
Can funds found abroad be drawn in by the executor?
Yes, the executor is entitled to demand that all monies in the estate be drawn in, even if they are located abroad.