The device MODULE NUL is a data sink. A NUL file is distinguished by the name of the file when it is opened. NUL file names are prefixed with the STRING:

"NUL" & $devModBrkStr

e.g., NUL>xxx if $devModBrk is > (xxx may be omitted). Case is ignored in the device MODULE prefix.

Data written to NUL files are discarded. When a read is performed from a NUL file, the file acts as if end-of-file had been reached.