Newbie qn - How do I check if a schema exists?

Hi,
Sorry for askin a stupid qn.
How do I check if a particular schema exists?
Is schema the same as a user?
Thanks,
Mel

After going through other messages I think I have found the answer to my qn.
I guess connecting to sql*plus with the schema name proves that the schema exists. Can someone confirm this?
Thanks,
Mel

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    500
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    0
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    0
    print.printer_HP_Photosmart_D5300_series.print_unwriteable_margin_top
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