Uniden UBC3300XLT Owner's Manual page 89

Screen Mask - Screen Mask reduces the amount of
information that appears on the display. Alpha tags that you
have set for a channel along with a few function icons will
appear only on the display. This mode is particularly useful
in public safety vehicles where that are already overloaded
with information. Screen Mask does not work in Search
mode.
Status Bit - This term refers to Motorola Type II systems.
There is a method by which special types of
communications utilize unique talk group numbers.
For example, if all emergency calls are set to occur on a
specific talk group number then you will not miss the
transmission even if you have not programmed all the talk
group numbers. With the Status Bit on and you have
programmed the unique number, then you don't have to
worry what the rest of the groups numbers are. The topic of
interest will be picked up.
Talkgroup - A group of users within a trunked system that
communicates with one another.
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