IBM Professional Series User Manual page 345

Field
Userid
Program
Product Bit
Map
Description
The userid of the virtual machine
issuing the DIAGNOSE.
Identifies the program products that
are installed. Valid values and the
program products each identifies are:
Value Program Product
X'OlOOOOOOOOOOOOOO'
VM/PC
Characteristics
8 bytes,
EBCDIC
8 bytes,
hexadecimal
Upon return, Ry contains its original value less the number
of bytes that were stored.
No completion code is returned, and the condition code
remains unchanged.
A-6 VM/PC Users Guide