SS Activates the secondary input buffer. Synopsis SS Arguments None. Description The SS PROC command activates the secondary input buffer as the current input buffer. This deactivates the primary input buffer. The SP and RI commands activate the primary input buffer, deactivating the secondary input buffer. See Also RI PROC command SP PROC command This website uses cookies to help us give you the best experience when you visit. To find out more, please review our Privacy Policy . OK, Got it