item in list...

How do I determine whether a list contains a particular item? For example, I’m setting a variable to a list of all the desktop printers (OS 9, obviously), then I need to determine whether the entire list contains a particular printer, and if not, then perform some task. I need to be able to check the entire list for the particular printer’s name before performing the resulting task. I’m able to check each item one-by-one in the list and perform a task according to the result from that check, but I’m having trouble with a collective check of the entire list.
Get it?

if particular_printer is in list_of_desktop_printers then <blah, blah, blah> end if