Query System (20)

3270 5250 VT
Yes Yes Yes

The Query System function can be used by an EHLLAPI application program to determine the level of Z and I Emulator for Windows support and other system-related values. This function returns a string that contains the appropriate system data. Most of this information is for use by a service coordinator when you call the IBM Support Center after receiving a return code 9 (a system error was encountered).

The bytes in this returned string are defined in Return Parameters.