Expanding on Tinkster's fine comments.
1. mounting your home dir from another system (assuming all *nix systems) would usually be accomplished by NFS.
At the client end, autofs simply automounts NFS exports that are available to you, subject to the usual ctrls.
This is an alternative to putting the entry in the client's /etc/fstab
2. distributed login ctrl (what you're asking for) would probably be accomplished via LDAP
As you mention Fedora, here is the RHEL 5.x Admin HOWTO manual that covers these areas http://www.linuxtopia.org/online_boo...ion/index.html
NB: use of NFS, LDAP etc requires the co-operation of the other systems & therefore their SysAdmins ...