As data is read from or
written to a file there is a pointer inside the file which keeps
track of how far through the file it has got. This command simply
returns the position of this pointer.
fileId is the id of the file obtained
from Ask Open File or Open
pos is the current position in the
file. If the file is not open or fileId is invalid then this
will cause an error. Position is different depending on the data
format of the file.
The position indicates the amount of data that has been stored.
Integers and floats are both 4 pieces of data long. A string
is the length of the stored string plus 1.
The position indicates which line of the text file to access.
Each piece of data should be stored on a separate line.