Peptide Composer is a computer program that has to be activated (validated) for each single installation. To validate the installation click the 'validate' button upon startup of the program. Write down the 'Validation Request Number' (VRN). Fill out the mail form below on this web page with your name and address and include the VRN. A validation number will be sent back to you within a few working days. Type this validation number into the 'validation' window of Peptide Composer. This will activate your installation for the lifetime of your operating system.