Compaq t1000 - Terminal Thin Client PC Manual page 94

The meaning of the symbols is as follows:
T
Indicates that a Telnet session is running.
Indicates that the current screen is an IBM 5250 screen. This screen displays
when you have initiated a Telnet session with the host.
M
Indicates that the system has one or more messages waiting for you.
^
Indicates that the keyboard is in Insert mode. Already existing characters to the
right of the cursor move to make room for new characters that are entered. Insert
mode can be disabled by pressing the Insert key again, pressing the Reset key,
or by performing any action that sends data to the host, such as pressing the
Enter, Clear, or PF keys.
x
Indicates when input from the keyboard or mouse is not accepted by the host.
When this is because an error has occurred, as shown in the error line, pressing
the Reset key removes the error. Alternatively, more information can be
obtained by pressing the Help key. The only other keys available are Attn, Sys-
Req, and Print. Note that the emulation includes typeahead capability so that in
most cases you can continue to enter data without waiting for the Do Not Enter
message to clear as the data is stored until the host is ready.
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