Sales; providing training, instruction and related educational services; preparing and selling training and instruction books and manuals in both print and electronic format; providing specialized services for all electronic, digital and related types of equipment, devices, and systems including, but not limited to, their maintenance, repair, support, installation, networking, security, communications, data storage and retrieval and on-call help and assistance; to buy, sell, manufacture and/or proprietarily modify or adapt electronic equipment, devices, accessories and supplies including systems and software of all kinds related thereto