Juniper Allegro CE Owner's Manual page 135

Select the IrDA port from the drop-down list. Tap the OK button.
Using USB/Power Dock Connection
If you already have ActiveSync installed and for all additional
connections go to the ActiveSync Connection Process section found later
in this chapter. When establishing a USB connection between the
Allegro and the desktop PC for the first time, complete the following
steps:
1) Plug in the USB cable into the desktop PC and then into USB/
Power Dock.
2) Double-click on the ActiveSync icon on the desktop PC.
3) Place the Allegro into the USB/Power Dock. The Allegro
automatically turns on and the Getting Connected screen
disappears.
The USB is the default port and should already be selected. To double
check the setting, tap the Start button and select Settings|Control
Panel|Communications Properties. Tap the PC Connection tab. At the
bottom of the dialog box under Connect using you see the COM port
the Allegro is set on for the connection process.
Windows CE Page 4-75