Psion Teklogix 7535 G2 Quick Reference Manual page 23

No modifications of this Agreement shall be effective unless in writing and
approved by us.
You acknowledge that you have read this Agreement, understand it, and that
it is the complete agreement between you and Psion Teklogix with respect to
the subject matter hereof and supersedes all prior agreements, oral or written.
Psion Teklogix 7535 G2 Hand-Held Computer Quick Reference Guide 17