Potential answers for "Windows or Unix, briefly"

⭐⭐⭐⭐ OPSYS
⭐⭐⭐ OPERATINGSYSTEM
⭐⭐ ACS
⭐⭐ XMAIL
⭐⭐ QMAIL
⭐⭐ USERIDS
⭐⭐ OCTAL
⭐⭐ SYS

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