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HELP SYSMATCH updated Mark Rubinstein October 1985 sysmatch(pattern, structure); SYSMATCH takes two arguments - a pattern and a data structure. It returns TRUE iff the pattern matches the structure (see HELP MATCHES for details of the meaning of 'matches'). Any variables that SYSMATCH binds it adds to the list in the variable POPMATCHVARS. If a variable in the pattern is already in POPMATCHVARS then SYSMATCH uses its existing value rather than giving a new value. MATCHES is defined in terms of SYSMATCH, thus: define 4 structure matches pattern; vars popmatchvars;  -> popmatchvars; sysmatch(pattern, structure) enddefine; See HELP * MATCHES.