h6. [[OS SWI Calls]] h6(. » [[OS_ReadSysInfo]] h6((. » OS_ReadSysInfo 13 h2. OS_ReadSysInfo 13 h5. (SWI &58) |_<^{width:4em}. Entry | | |<^. R0 |<^. 13 | |<^. R1 |<^. Pointer to key handler, or 0 to just return valid flags | |_<^{width:4em}. Exit | | |<^. R0 |<^. Mask of valid key handler flags | h4. Use The purpose of this call is to allow the owner of a key handler to validate it before installing it via [[OS_InstallKeyHandler]], or to read which key handler flags this OS version supports. h4. Notes If a key handler has been supplied and is invalid, error &1F4 ("Bad key handler") will be returned. If no key handler has been supplied and the SWI generates an error (e.g. &1EC, "Unknown OS_ReadSysInfo call"), then take it as an indication that the kernel doesn't support the new key handler format at all. h4. See also * [[OS_ReadSysInfo]] * [[OS_InstallKeyHandler]]