1INCLAN: print, error - print messages

Usage: print <text> [level=minimal|normal|full|debug]
       error <text>

The statements "print" and "error" write the message <text> to the 
output. "error" also invokes the error handler (as set with the 
variable "erract") and is thus useful to print error messages from 
within a macro.
In the "print" statement the "level" option can be used to determine 
whether the message is written or not, depending on the value of the 
system variable "info".

See also: erract, info