Computer software for enabling real-time communication over the Internet; computer software for instant messaging, Voice over Internet Protocol (VoIP), video conferencing, audio conferencing, application sharing, computer desktop sharing, file transfer, sensing and providing user presence information, and telephony; computer software for mobile devices to secure remote access via the Internet to private computer networks; computer software for facilitating the interoperability of multiple software applications; computer software for enabling users to identify availability of other users and integrate electronic address books and calendars; computer software for use in transmitting information, video, voice, audio, and content over a global computer information network; computer software for enabling users to communicate, collaborate, and share computer screens, desktops, data, electronic documents, video and applications via the Internet; computer software for viewing, managing, editing and storing documents via computer networks; computer software for scheduling and managing calendars, contacts, online meetings, telephone conferencing, and video conferencing