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Articulation tools
Each corner button adds the indicated mark to a selected note or group of notes; the inner button changes the note back to its "plain" form. These can be combined where reasonable; for example it's possible to combine staccato and tenuto marks to indicate "stressed and moderately short." These expressive marks sometimes have an imprecise meaning; following is a list of typical interpretations:
staccato: 
Played somewhat shorter than the notated value.
tenuto:
Held to its full value. Also can mean a pressure accent.
accent:
A moderately sharp attack, in context of the prevailing dynamic level.
wedge:
Played very short. In modern practice also indicates martellato in string playing (heavy accent with the heel of the bow).
tenuto/staccato:
Stressed and moderately short
tenuto/accent
Percussive, but with full value.