Umm, Maria, the SPACE with U is not necessary.  Just press dots 4-5-6.  Unless 
you changed something with the lower case Unicode table which I doubt, dots 
4-5-6 should enter an underscore just fine.  The reason why you still get an 
underscore when you set the upper case mode is that dots 4-5-6 is listed in 
both the lower and upper case tables for ASCII character 95 which is the 
underscore (called "low line".  Other examples like this are the period, comma, 
exclamation point, question mark, etc.
On the other hand, some dots are assigned to different symbols in the lower and 
upper case tables.  The most obvious examples are the letters; e.g., dot 1 is 
listed in the lower case table corresponding to lower-case a (ASCII character 
97), while it is listed in the upper case table corresponding to ASCII 
character 65 (capital A).  Another example would be dots 4-5 which is a tilde 
(ASCII character 126) in the lower case table and a caret (ASCII character 94) 
in the upper case table.  All this just to tell you that dots 4-5-6 without the 
SPACE with U before it will produce the underscore just the same, so spare 
yourself the trouble of pressing that keystroke.
Now if memory serves, I think you're using the Spanish multilingual software.  
Dots 4-5-6 is the key assignment for the underscore in the USA computer table.  
FYI, in the Spanish computer table, the underscore is a dot 6.

HTH,
Roselle

>----- QUOTED MESSAGE -----
>Sent by: Maria Kristic <[EMAIL PROTECTED]

>Hi John, Kellie, Roselle, Jim, Sarah, and everyone else,
>Thank you all very much for your suggestions with my underscore problem.  
>Using six-dot Computer Braille, I was able to enter an underscore by pressing 
>SPACE with U and then dots 4-5-66.  The help was much appreciated.
>Best Regards,
>Maria




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