Pen pal. For other uses, see Pen Pals (disambiguation). Adopt a School Program, connecting Iraqi schools with U.S. schools to help with supplies and start a pen pal program. Pen pals (or penpals, pen-pals, penfriends or pen friends) are people who regularly write to each other, particularly via postal mail.
Shoot 'em up (also known as shmup or STG) is a subgenre of the shooter genre of video games. In a shoot 'em up, the player character engages in a lone assault, often in a spacecraft or aircraft, shooting large numbers of enemies while dodging their attacks.
A pop-up is a graphical user interface ( GUI ) display area, usually a small window, that suddenly appears (pops up) in the foreground of the visual interface. Pop-ups can be initiated by a single or double mouse click or rollover (sometimes called a mouseover), and also possibly by voice command or can simply be timed to occur. A pop-up window must be smaller than the background window or interface; otherwise, it's a replacement interface.