LET n "tmp.txt"
LET fh @APERS #<n "W+"#>
IF @NOT fh
	WUNT \FEHL "open: " _ n _ ": " _ \! _ "
	END 1
END IF
WUNT fh "zomg
IF @SUCH #<fh 0#>
	WUNT \FEHL "seek: " _ n _ ": " _ \! _ "
	END 1
FI
LET s fh . @NEG 1
IF @ERR-P fh
	WUNT \FEHL "read: " _ n _ ": " _ \! _ "
	END 1
FI
CLAUDS fh
IF \_
	WUNT \FEHL "close: " _ n _ ": " _ \! _ "
	END 1
END IF
s