Implementation of a virtual service includes connecting a set top box of a first user to a STB of a second user and a STB of a third user, providing a first video of the first and second users to corresponding STBs, and providing a second video of the first and third users to corresponding STBs. The alignment member acts to cause the aligned sheet to drop to the second sheet stacking portion. In another exemplary method the mobile device may be activated in an activation process in which the device verifies an activation ticket against information specific to the device and SIM card, and initiates activation when the verification of the activation ticket is successful. When the projectile comes into contact with the laser tunnel due to ballistic factors, a plurality of explosive outputs is generated and the projectile is directed back toward the center of the laser tunnel. The method includes limiting a region to be measured by the height detection section so that light reflected from objects behind or near the leads is excluded from the region and processing light reflected from the region, thereby removing the reflected light from objects behind or near the lead. The marking ink is printed on the covered conductor formed with polyolefin such as polyethylene and provides a high adherence, high wear resistance, high productivity, fast drying, and moderate spreading.