Programming variables (V.)

V.A. …	Axis-specific variables
V.SPDL. … V.SPDL_PROG. …	Spindle-specific variables
V.G. …	Global variables
V.P. …	Self-defined variables, program global
V.S …	Self-defined variables, (main) program global
V.L. …	Self-defined variables, program local
V.E. …	External variables
V.CYC. …	User-defined variables, cycle variables
V.TOOL. …	Tool identification variables
V.TLM. …	Tool life variables
V.RTG. …	Channel-specific realtime variables
V.RTA. …	Axis-specific realtime variables