If it is shared as an nfs exported file system, then the nfs mount commands (mount <server>:/filesystem /<local mount point>) are what you need.
If its is shared as a Windows (SMB) based fs then you would need samba packages loaded.
If it is shared as an iSCSI type device then you would need to install iSCSI drivers, which Solaris didn't have until 10 (and Upadte 1 or 2 I think).
HTH
Dom