The opportunity to do so that the VC could not see that you are online available on computers and mobile devices. In the first case, go to your browser menu and open the search tab and download plug-ins. Type in the search box the word VK, VK, or Vkontakte, and look at the results. Today there are plenty of plugins that opens hidden features of the social network, including stealth mode.
On that computer, install one of the programs that allows you to be invisible Vkontakte. One of the best is VkLife, since it uses a special script that hides user actions on the page. It should be remembered that over time, some applications may cease to function, since administration of VC gradually closes the "hole" in the internal code.
To hide that you are online Vkontakte allow a mobile app developed for devices based on Google Android and Apple iOS. Go to Play Market or AppStore and search for already known keywords with the name of the social network to find the program with the desired functionality. The most famous is the Vfeed (VK Feed). However, applications that allow you to sit VC in stealth mode, often removed from the list available, however, the administration of the social network has nothing against messengers. This is a small app with only one opportunity to exchange messages with users from your friends list. At the same time on the main profile page will not mark "online".
To hide Vkontakte, just go to any page and wait a few minutes without doing any action. Previously, for example, to open the video or put on the playing song, go to dialog, etc. If after that you don't need to touch the mouse and keyboard, the system determines that you are not online, but this is enough to make any distraction at this point.
If you want to ... haven't seen you online VK for some specific users, it is easiest to add them to the blacklist in the privacy settings. You completely limit their ability, and if they try to join your page, then you will not see anything except the small pictures. In addition, there is always the opportunity to register additional Facebook page for another SIM card to calmly deal with any Affairs in secret from the users in the friends list on the main profile.