Programmed Transmission Control, which were programmable message switching systems. Most programmable thermostats will control these systems. The issue also exists in programmable logic controller applications. Audio capabilities were CPU controlled with programmable frequency and duration. IEC 61131 is an IEC standard for programmable controllers. It is commonly used for programming microcontrollers, EPROMs, and other types of programmable logic devices. These could be copied using a programmable remote control. IEC 61511 covers the application of electrical, electronic and programmable electronic equipment. It incorporated fully programmable pixel and vertex shaders. This program is similar to those used to optimize a programmable logic array. AstoundSound is described as fully programmable audio engine. Robolab is the newer programming environment originally used on the RCX programmable brick. The following enumerates some of the features that are commonly implemented for programmable snippets. It is a member of the HP Voyager series of programmable calculators. This has created a new breed of ATM applications commonly referred to as programmable applications.