Despite what many people --mostly in the computer field-- think, "login" is not a verb. It's simply not. Whether or not "login" is a word at all may spark a debate in some circles, but assuming it is then it may act as many parts of speech, but not as a verb.
I will repeat the important part for clarity: "login" is not a verb. It's simply not.

"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo." is a grammatically correct sentence used as an example of how homonyms and homophones can be used to create complicated constructs

"James while John had had had had had had had had had had had a better effect on the teacher" is an English sentence used to demonstrate lexical ambiguity and the necessity of punctuation,[1] which serves as a substitute for the intonation,[2] stress and pauses found in human speech.[

I have, or, well, had, David Foster Wallace to thank for my own peevishness about mistakes in what he called S.W.E., or Standard Written English. So what follows is the complete text of a worksheet from his class.

Answers here: http://htmlgiant.com/?p=20022

Using "they" instead of "he" or "she" as a singular pronoun.