How to enable file sharing for computers behind a Mikrotik?

How to enable file sharing for computers behind a Mikrotik server all works with win xp service pack 3?

I have a network of 5 pcs connected via switch and there’s a mikrotik server connected on the same switch which feeds another wireless lan with internet connection but computers behind the server can’t see my network neither I can see those behind mikrotik from my local network. how to enable file sharing and remote disktop between the 2 lans wired & wireless ?! more over how to make every pc in the 2 networks see the other pcs either wired or wireless ?!

Hope you are routing between the networks. If there is no firewall between you should be able to access all ip addresses. Computer names set in Windows will not work in between.