<http://webisa.webdatacommons.org/151534790>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<perlmonks.org> .
<http://webisa.webdatacommons.org/151534790>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/208206325>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/151534790> .
<http://webisa.webdatacommons.org/151534790>	<http://www.w3.org/ns/prov#value>	"My question, then: How can I test whether the spreadsheet is already being used by another program (namely, Excel)?" .