I think there is a bit of confusion here.
ArcaOS has the Arca Mapper program.
That program can connect to network shared resources. The shares can be on Lan Server, Peer Server, Win10, Win8, Win7, etc. The shares need to use tcpip (sometimes called netbios over tcp). The older operating systems such as Lan Server, Peer, WFWG, Win98, Win NT, Win2000, use a less secure connection protocol but you can connect to them all with ArcaOS "out of the box."
And I forgot to mention you can even connect to Apple Mac OS shares, High Sierra, etc.
ArcaOS does not install the Peer components at install unless you select one of the protocols for netbios. But... do you really need Peer? A simple selection of tcp only in the adapters is all you need for most shares using the the ArcaMapper to connect.
There is a file that controls the protocol. It is: \mptn\etc\samba\smb.conf
With certain parameters you can allow various types of connections.
The file is used by the Samba server as well as the Arca Mapper.
Here is what you need to connect to a Lan Server or Peer share:
---8<--- snip --- 8<---
# samba client & server file
# smb.conf
#
; client params
; these two for LAN Server /peer
client lanman auth = yes
client NTLMv2 auth = no
; enable this param for Win10 shares
;client NTLMv2 auth = yes
---8<--- snip --- 8<---
You can also use the Netdrive program to connect to the shared resources. It is a fantastic drop in replacement for ArcaMapper. I actually prefer the Netdrive program over the ArcaMapper. The Netdrive can connect to ftp, scp, local loopback, in addition to what the ArcaMapper does. The Netdrive program is not free though.
If you want your ArcaOS to act as a server, you can use the Samba server or install the Peer Server. The Samba server is a more modern way to go, but you don't have the slick Lan Server GUI, and you will be serving files in a less secure protocol.