Design
Server 1.0 contains a mix of features from the classic Mac OS, NeXTSTEP and Mac OS X. It has a single menu bar across the top of the screen like Mac OS but file management is performed in Workspace Manager from NeXTSTEP instead of the Mac's Finder. The user interface still uses the Display PostScript-based window server from NeXTSTEP, instead of the Quartz-based WindowServer which would appear a year later in Mac OS X Public Beta. Windows with unsaved content display a black dot in the window close button like NeXTSTEP. The Dock and the Aqua appearance were still being developed and thus not included; these were later added to Mac OS X.
"Carbon", essentially a sub-set of "classic" Mac OS API calls, was also absent. This meant that the only native applications for OS X Server 1.0 were written for the "Yellow Box" API, which went on to become known as "Cocoa". Furthermore, Apple's own FireWire was not supported.
Server 1.0 also includes the first version of a NetBoot server, which allows computers to boot from a disk image over a local network. This was particularly useful in a school or other public-machine setting, as it allowed the machines to be booted from a single OS copy stored on Server 1.0, making it difficult for users to damage the OS by installing software – as soon as they signed out, the machine would re-boot with a fresh OS from the NetBoot server.
To run classic Mac OS applications, Mac OS X Server 1.0 includes the "Blue Box" which essentially ran a copy of Mac OS 8.5.1 in a separate process as an emulation layer. This became the "Classic Environment" in Mac OS X, though it was no longer Mac OS 8.5.1 being run, but the latest version of Mac OS 9. It was not officially Mac OS X.
Read more about this topic: Mac OS X Server 1.0
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