Consider the words on the screen. There are two sources of information.
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The words, how they’re arranged and such.
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The meaning that you assign to the words. Meaning drawn from a lifetime of memories.
99% of the information comes from the assigned meaning. So 99% of what’s going on here is you talking to yourself.
Language arises out of social behavior, beginning with imitation and reinforcement in early childhood. Children who don’t learn language (by interacting with adults and older children) in the critical period of early childhood, suffer serious developmental problems. So language is fundamentally anti-solipsistic, even anti-individualistic: you only acquire it by being brought into a community of language-users.
And written language begins as an encoding for spoken (or signed) language: everyone learns to speak (or sign) before they learn to read, and learning to read starts with learning associations between written structures and spoken ones. (For English-speakers, that means phonics: the relationship between letters or groups of letters, and sounds.)
Meaning isn’t “assigned” solipsistically; rather it’s “acquired” from a community of use. A single user can’t decide for themselves that “dog” means squirrel. I suspect that if you look at the word “dog” and try to convince yourself that it refers to a bushy-tailed tree-climbing nut-munching rodent, you will be aware that you are doing something very silly, something deliberately contrary to your knowledge.
In the past you received a symbol, and a meaning to go with that symbol.
In the present, you refer to that meaning when you see that symbol.
Yes, there was some kind of deeper communication in the past. The dictionary was written (among other things. Like the vastness of non-symbolic experience. Sensations and such).
But in the present, in the act of “reading”, it’s just you, the dictionary (symbolic and nonsymbolic) and the symbol stream. However you slice it, the dictionary is large and the symbol stream is small.