Essentially all globular clusters contain multiple stellar populations, and their presence has even been proposed to be a defining characteristic of globular clusters. In contrast, the less massive and usually short-lived open clusters do not show evidence for multiple stellar populations. The origin of photometrically or spectroscopically identified multiple populations remains a major unsolved puzzle though. If multiple populations do indeed form exclusively in globulars as our current knowledge suggests, they may be used to trace the globular cluster contribution to the field. Chemically, multiple stellar populations stand out by their light element abundance variations. The search for these chemical signatures among field stars permits us to identify candidates that were likely stripped from globular clusters. An alternative method is the search for stars that are chemically and kinematically consistent with an origin from specific globular clusters (while not necessarily showing light element abundance variations). Mapping such present-day field stars will ultimately allow us to quantify the role of globular clusters in the build-up of field populations.