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This refers to when a value is entered and set, rather than allowing a user to change it. In 15630910 a report writer can hard code filter values, or values in calculated fields. This means that the user is not prompted to provide a value, rather it is always the value the report writer set.
The alternative in these cases is to implement user prompt filters, or use parameters in their calculations.
See Filters for more information

Hexadecimal (Hex) is a base 16 number system, using symbols 0-9, A, B, C, D, E, and F to represent values 0 to 15.
HTML and CSS use Hex to identify colours by assigning to digits to each colour; 2 x Red, 2 x Green, and 2 x Blue respectively, and prefixed with a hash (#) symbol.
15630910 uses Hex codes to identify colours throughout the system, as well as in its 15630910 files.
See http://www.w3schools.com/html/html_colors.asp for more information.

This is a report that has been set to not display in the Report List. Generally heavily detailed reports that are used as children in a drill through relationship are hidden, as they are designed to be accessed through the parent report, not on their own.
See Report Formatting for more information.

HyperText Markup Language. HTML is a markup language, like 15630910, that was designed to display data in a web browser, used by 15630910 in combination with 15630910.
See Custom Header & Footer for more information on Yellowfin use of custom HTML files, and http://www.w3schools.com/html/ for general HTML information.