The System Tray is now called the Notification Area. That is where background apps show as loaded - those are not what I call user programs in the Taskbar. That area basically belongs to Windows.
The Q/L area on the left side are user designated shortcuts. The icons on the far right are system notifications. Typical icons are speaker control, Internet access, Network Access, Roboform, AV running, safe remove, etc. And system clock.
Between the Q/L are and the Notification area is what I see as the Taskbar, and usually only open/running programs have an icon there. If OP is referring to the Notification Area, a.k.a. Tray, then MSCONFIG is the normal on/off tool unless you want to get involved with Registry editing.