Communicating With The Host Control Program - IBM 3708 End-User Reference

Communicating with the Host Control Program
After you start communicating with your application in full-screen mode, you can
communicate with the host control program by using the SYS REQ function. When
you press the SYS REQ key sequence, your screen clears and SSCP replaces MYJOB
in the status line.
When sending messages to the control program, you are no longer in full-screen
mode. You can only type in a message (up to 256 characters) beginning at the
current cursor position. When you press Enter, the data (excluding nulls) beginning
with the original cursor position and extending 256 positions (or extending to the
end of the screen) is transmitted to the host.
Data received from the control program is displayed at the current cursor position.
When SSCP is displayed, the following functions are not available:
• PFI to PF24
• PAl to PA3
• ATTN.
If you press one of these key sequences, the keyboard is locked, and the "invalid
function" status line message (X -F) is displayed. To unlock the keyboard, press the
Reset Key sequence defined for your terminal and reposition the cursor.
To return to your application program session, enter the SYS REQ key sequence
again. The screen clears, and MYJOB replaces SSCP in the status line.
A common use of this function is to log off the application that is running. You
would use the SYS REQ key sequence to start communication with the host control
program, then type in a logoff request as defined for your installation.
oP6
OP6
Operational Note: Data transfer while in control program mode occurs on the SSCP-SLU session; application data
transfer occurs on the PLU-SLU session.
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IBM 3708 End-User Reference