/usr/bin/urxvtcd is in rxvt-unicode-lite 9.19-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 | #!/bin/sh
urxvtc "$@"
if [ $? -eq 2 ]; then
    urxvtd -q -f
    exec urxvtc "$@"
fi
 |