The macro tt(NOUSERMACRO) controls tt(yodl)'s warnings in the following 
respect. When tt(yodl) is started with the tt(-w) flag on the command line, 
then warnings are generated when tt(yodl) encounters a possible macro 
name, followed by a parameter list, but fails to lookup the macro. The 
tt(yodl) program then prints something like tt(cannot expand possible user 
macro). 

Examples of such sequences are, tt(The necessary file(s) are in 
/usr/local/lib/yodl), or tt(see the manual page for sed(1)). The candidate 
macros are hee tt(file) and tt(sed); these names could just as well be `valid' 
user macros followed by their parameter list.

When a corresponding tt(NOUSERMACRO) statement appears bf(before) tt(yodl) 
encounters the candidate macros, no warning is generated. A fragment might 
therefore be:

verb(\
NOUSERMACRO(file sed)
The necessary file(s) are in ...
See the manual page for sed(1).
)

The tt(NOUSERMACRO) accepts one or more names in its argument, separated by 
spaces, commas, colons, or semi-colons.
