Package: xfce-utils

"xfce-utils" package binaries on CentOS:

/usr/bin/startxfce4 /usr/bin/xfbrowser4 /usr/bin/xfce4-about /usr/bin/xflock4 /usr/bin/xfmountdev4 /usr/bin/xfrun4 /usr/bin/xfterm4

You may install this package on CentOS with yum install xfce-utils