HP F2226A - 48GII Graphic Calculator User Manual page 826

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You can type two or more letters of the command of interest, by
locking the alphabetic keyboard. This will take you to the command
of interest, or to its neighborhood. Afterwards, you need to unlock
the alpha keyboard, and use the vertical arrow keys —˜ to
locate the command, if needed. Press @@OK@@ to locate the to activate
the command.
you can use, one of the following keystroke sequences:
I L@HELP ` ~~pr ~ ˜˜@@OK@@
I L@HELP ` ~~pro ~ ˜@@OK@@
I L@HELP ` ~~prop ~ @@OK@@
See Appendix C for more information on the CAS (Computer Algebraic
System). Appendix C includes other examples of application of the CAS help
facility.
For example, to locate the command PROPFRAC,
Page H-2