The SPARCstation, SPARCserver an SPARCcenter product lines were a series of SPARC-based computer workstations and servers developed and sold by Sun Microsystems, consisting of desktop, deskside (pedestal) and rack-based models. The desktop and deskside SPARCstations and SPARCservers of the same model names were essentially identical systems, with the only difference being that systems designated as servers were usually "headless" (that is, configured without a graphics card and monitor), and sold with a "server" vs. a "desktop" OS license. For example, the SPARCstation 20 and SPARCserver 20 were almost identical in motherboard, CPU, case design and most other hardware specifications.