Any valid file number
Any whole number between 1 and 2,147,483,647
Places the read/write marker at a given position where the next read/write operation should occur
If the file has been opened in Random mode,
position refers to the next record number
that should be read or written.
In all other file open modes (Append, Binary, Input, and Output),
position is the byte where the next read
or write operation will start.
The use of a record number in any subsequent FileGet or FilePut procedure overrides the position set by the Seek procedure.
The size of a file can be increased as the result of a write
operation that is performed after a call to the
Seek procedure in which
position is beyond the end of the file.
position is 0 or negative, a runtime
error will be generated.
Unused records in a random-access data file are not necessarily blank. For example, if you open a brand new data file, then perform a seek operation to record number 10 and write a new record, the preceding 9 records will be filled with binary data that was present on the section of the disk used by the new file prior to its creation.