HP 50g Graphing Calculator - Manual (Page 106)

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Press @@OK@@, to get:
Then, press )@@S3@@ to enter ‘S3’ as the argument to PGDIR.
Press ` to delete the sub-directory:
Command PGDIR in RPN mode
To use the PGDIR in RPN mode you need to have the name of the directory,
between quotes, already available in the stack before accessing the command.
For example: ³~s2`
Then access the PGDIR command by either of the means shown above, e.g.,
through the ‚N key:
Press the @@OK@ soft menu key to activate the command and delete the sub-
directory: