This block provides a way to store connections to blocks that then can be activated from its GUI. To make a connection, you have to make sure that it has enough Link Providers; then you use Assigner to mark a target block by shift+right clicking it and then right clicking the Activator.
In the GUI you can view linked blocks and write a label for any of them. To activate a block, press corresponding button. To remove a connection, shift+click the corresponding button.
Linked blocks can be activated from as far as ~150-170 meters away from them.
Some mods' blocks can't be activated from long distance. In this case, report it to the maker of Fine Technology and he will consider implementing support for these blocks.