I found it in this link

http://aics-research.com/qcterm/escape.html

Esc&f<attr>a
<key>k
<lbl len>d
<str len>L
<label>
<string>  1 Defines the attributes for the function key <key>

<attr>
0 
Normal (N) (default) 
1 
Local only (L) 
2 
Transmit only (T) 
 
<key>
1-8
F1 to F8 function key 
 
<lbl len>
 
Number of characters in the label. The label length plus the string length must 
be less than or equal to 255 characters. Only the first 16 characters (32 if all 
are muted characters) are used in the label. (Default = 0). 
 
<str len>
 
Number of characters in the string. A length of -1 clears the label. The label 
length plus the string length must be less than or equal to 255 characters. 
Only the first 80 characters (160 if all are muted characters)are used in the 
string. 
 
<label>
 
The label is entered at this point in the sequence. (Default = no label). 
 
<string>
 
The character string is entered at this point in the sequence. It may contain 
display enhancements and character set changes. (Default = no string).  

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