The phrase "active letter" is correct and usable in written English.
It can be used in contexts where you are referring to a letter that is currently in use or has a specific function, such as in programming or communication.
Example: "Please ensure that the active letter in the document is highlighted for easy reference."
Alternatives: "current letter" or "live letter".
On top of this exogenously driven modulation, however, voluntary attentional control during the active letter search attenuated activity only in the periphery and only when distracters were present.
Whether it's because they were less active letter writers and diary keepers than their English contemporary Thomas Cromwell, or because they lacked his innate subtlety and intellectualism, or because Sarah Dunant — adroit as she is — falls short of Mantel's narrative mastery, neither Rodrigo nor Cesare speaks in a voice as sustained and nuanced as the one Mantel conjured for her central character.
By means of a single ocular movement (up, down, left and right) the subjects were then able to move a cursor over a screen keyboard, passing from one letter to another; a double eye blink was then necessary to select and write the active letter.
During Hinde's final years, he was an active letter writer and watched over his many business and real estate interests.
He was also an active letter-writer, corresponding with contemporaries high and low, famous and obscure, and carefully preserving his letters and publishing some of them since like his Roman models, he regarded the letter as an important literary genre.
In SMPTP for fabricating gene-chips, porous fiber tubes with a number of nanometric or micron channels functioned as "active letters" and were assembled in designed patterns, which are identical to the distribution of monomers in each layer of the array, and four patterns were needed for each layer.
While Mike's active-duty letters, full of mud and gore, form part of the story, it is Farrington's unsparing account of Lizzie's life at home — the desperately untidy house, her small attempts to carve out time for herself, her mounting anxiety — that takes the novel beyond its particular time and place and makes it a captivating study of tenderness and blame.
Two months later Move.com sent Active Rain a letter of intent to acquire the company for $30 million, although it isn't clear that either side actually signed the letter and made it binding.
The response rates to the invitation letter (active approach) and posters and leaflets (passive approach) were 33% and 1%, respectively.
CFO of Miller Automatic in Monticello, NY for 35 years, Roz was a woman of letters, active in civic affairs, club champion golfer, extremely capable, and passionate about all she knew and did.
In terms of the 'traction hierarchy', active users and letters of intent probably fall into the next tier below real sales, finally followed by viewer numbers (on your website).
