A computer which is portable and transportable by a person and which can be used on a table, can also be coupled with a support affording the possibility to use the computer in further operating conditions, particularly for use in vehicles. The support comprises a securing means affixed in the cab of a vehicle as well as a height adjustment arrangement for adjusting the computer's height in the cab when attached to the support. Also the support includes pivots so the computer is adapted to be pivoted about an upward axis and also a horizontal axis. The support in one embodiment comprises at least two hinges which can be locked by a single clamping means.