The UED pseudo-open control block is addressed by the parameter list passed to the user-written exit UUEDEX. The data in this control block is used to identify the file being edited and to provide additional information about that file.

Location		Length	Format	Contents
Dec	Hex
0	0	44	Character	File name
44	2C	8	Character	Member name
52	34	6	Character	Volume serial number
58	3A	2	Character	Two-character library identification
60	3C	4	Binary	Address of I/O control blocks
64	40	4	Binary	DSCB address
68	44	4	Binary	DCB address
72	48	4	Binary	DEB address
76	4C	4	Binary	IOB address
80	50	4	Binary	UCB address
84	54	4	Binary	Buffer address
88	58	4	Binary	Address of library table entry
92	5C	2	Binary	DSORG indicator
94	5E	1	Binary 1....... .1...... ..1..... ...1.... ....1...	Flag byte 1: Open for output Output, only shared ENQ Open completed Error call for U2EDXCLS Dev permanently resident
95	5F	1	Binary 1....... .1...... ..1..... ...1.... ....1... .....1..	Flag byte 2: Freemain I/O control blocks Dequeue SYSDSN Dequeue SYSIEWLP Deallocate UCB Freemain format 3 DSCB Freemain buffer
96	60	2	Binary	Additional flags