The nexuslua function addoffset adds an offset to a Lua variable of type light user data. It accepts 3 parameters:

the base address of type light user data (in nexuslua, typically the result of a call to touserdata)
an integer containing the number of elements to add
an integer containing the byte size of an element

Therefore, the resulting memory address will be the product of the latter two values. For an example see poke.

See also