Staccato no relation staccatissimo
Staccato ([stakˈkaːto]; Italian for "detached") is a form of musical articulation. In modern notation, it signifies a note of shortened duration, separated from the note that may follow by silence. It has been described by theorists and has appeared in music since at least 1676.In the first measure, the pairs of notes are in the same musical part (or voice) since they are on a common stem. The staccato applies to both notes of the pairs. In the second measure, the pairs of notes are stemmed separately indicating two different parts, so the staccato applies only to the upper note.
The opposite musical articulation of staccato is legato, signifying long and continuous notes. There is an intermediate articulation called either mezzo staccato or non legato. 
By default, in the music notation program Sibelius, "staccatos shorten a note by 50%."Staccatissimo
In musical notation, staccatissimo (plural: staccatissimi or the anglicised form staccatissimos) indicates that the notes are to be played extremely separated and distinct, a superlative staccato. This can be notated with little pikes over or under the notes, depending on stem direction, as in this example from Bruckner's Symphony No. 0 in D minor:
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