The Track Menu is a floating pull down menu which can be attached to any
of the mouse button functions. By default, to access the Track Menu, press
Ctrl-Shift-Right Mouse button. When you activate the Track Menu, it will
appear at the mouse pointer. The track menu in a 3270 session looks like
this (the track menu in a VT session differs slightly):

To select an entry, use the mouse and select the action you want to perform
or press the appropriate accelerator key sequence.
If you display the track menu and do not want to perform any action, simply
click anywhere else on the screen and the menu will disappear.