Data String Contents

Byte		Definition
Standard	Enhanced
1	1	A 1-character presentation space short name (PSID).
1	2–4	Reserved.
2	5	One of the following characters: L to lock the API. U to unlock the API.
3	6	One of the following characters: R to return if the presentation space is already locked by an application. Q to queue the Lock request if the presentation space is already locked by an application.
5–6	11–12	Function number of the completed asynchronous function (126 or 127). (returned)
5–6	7–8	Reserved.