deployed configuration with the detachable keyboard 300 in front of it such a configuration is useful for example where one wants to type a letter in the portrait configuration fig4 illustrates a two dimensional side view of the tablet holder 100 and the detachable keyboard 300 illustrated in fig3 fig1 to 4 show that the tablet holder 100 may be configured as an adjustable multiple viewing and hand writing support mechanism for a tablet computer one example non limiting embodiment of a mechanism for orienting the tablet computer at a desired display angle are the load bearing rotation lock mechanisms shown in fig3 to 61 for fixing the angular position of a tablet holding mounting plate or device at sustainable loads of one pound 1 lb and above at display angles ranging from about 5 degrees to about 60 degrees fig5 illustrates a rear perspective view of a tablet 110 mounted on a tablet holder 100 against a fixed surface 101 with one of its supporting elements 125 b extended to orient the tablet in the portrait orientation with a penholder 200 attached fig6 illustrates a perspective view of a tablet 110 mounted on a tablet holder 100 against a fixed surface 101 with one.