Remote Desktop has some really handy shortcuts that are documented right there in the help file:
Shortcut key Description
ALT+PAGE UP Switches between programs from left to right.
ALT+PAGE DOWN Switches between programs from right to left.
ALT+INSERT Cycles through the programs in the order they were started.
ALT+HOME Displays the Start menu.
CTRL+ALT+BREAK Switches the client between a window and full screen.
CTRL+ALT+END Brings up the Windows Security dialog box.
ALT+DELETE Displays the Windows menu.
CTRL+ALT+Minus (-) symbol on the numeric keypad Places a snapshot of the active window, within the client, on the Terminal server clipboard (provides the same functionality as pressing PrintScrn on a local computer.)
CTRL+ALT+Plus (+) symbol on the numeric keypad Places a snapshot of the entire client window area on the Terminal server clipboard (provides the same functionality as pressing ALT+PrintScrn on a local computer.)