This section contains a list of typecodes used with PTC ALD macros and PIs. Typecodes define the type of information that should be applied for a parameter of a macro or PI.

For example, the syntax for the macro tcopy is tcopy filename:s, extended:o?. This macro has two parameters, the second of which is optional. The first parameter filename has a typecode of s, which means its value should take the form of a string enclosed in double quotes, e.g. "c:/3d/myfile.3m". The second parameter extended takes a value of 0 or 1 (off or on, respectively), indicated by the typecode o.