Ip to Name Problems


I am new to Mac and I have several pcs. they can talk to each other on the network by name. My mac will find the other computers by name but I have noticed it is not always working. I am using a linksys router to do dhcp. There is no domain. All the pcs are in a workgroup called workgroup. once I can get it to connect it keeps asking for a user id and password and never remembers it. might be the same problem, i'm not sure.