Maxima parser and global parameters



(%i1) ( fpprec:100, [fpprec, 1.123456890123456890123456890b0] );
(%o1)                     [100, 1.123456890123457b0]
(%i2) ( ibase:2, [ibase, 11111111] );
(%o2)                            [2, 11111111]


This shows me that in a first step the complete expression is read and parsed and in a 
second step the expressions are evaluated from left to right. 

Is it generally possible, that expressions like fpprec:100 can have an influence on the parser 
inside of the same expression, or can it only have effect on the next read in expression?

Volker van Nek