Mapping Network Drive

I have 5 computers connected together using peer to peer network. Three computer is running Win 2000 Pro and the other two computer is running Win 98 2nd Edition.

On all computer there is no password in login. I am able to map network drive between all Win 2000 Pro computers with no problem.

When trying to map network drive on Win 2000 Pro from Win 98Se computer it asks for password.

On all Win 2000 Pro computer there is no password on any of the user including Administrator.

How can I map network drive from Win 98se computer onto Win 2000 Pro without asking password? Or which password are they looking for?