Depending on which server you want to install on top of OS/2 Warp 4, you
need the installation CD from OS/2 Warp Server 4 Entry or Advanced. However,
the boot diskettes and the Advanced Functions CD are not necessary.
OS/2 Warp Server Version 4 CD 1 Entry Server/Advanced Server
2.2.1 OS/2 Warp 4
2.2.3 Possible
Installation Paths