This optional modifier can be placed at the end of a random file open statement to open a file for read only access. Any attempts to write to such a file will generate an error. Aside from locking issues, this mode may be used to dramatically speed up file access over a network for processes that require no locking, such as reports. Also see ASFLAG.SBR in the A-Shell XCALL Reference for a way to achieve this effect without using the BASIC Plus compiler extensions.