Administrative assistants manage office operations to keep work flowing without distractions or interruptions. They know how to use and maintain office equipment, such as copiers and scanners. Repair orders are placed in a timely manner. Supplies are regularly inventoried and ordered. Typically, this requires knowledge of basic booking to track purchases and stay within the office budget. Invoices are paid and refunds or exchanges processed., Administrative assistants work with office software programs, including spreadsheets, databases, word processing and graphic presentation software. For example, proficient is generally expected in Microsoft Office Word, Excel, PowerPoint and Publisher. Comfort and skill with technology is essential because a boss may rely heavily on an administrative assistant to format professional looking presentations, manuals, newsletters, website content and marketing material. Many employers also expect administrative assistants to be adept at sending messages via email and social messaging.