Your Clipboard in PubMed will keep everything you save to it for 24 hours. This tool helps you gather items as you search so that you can either send it to an email address, save it to a citation manager, or save it within NCBI, if you have an account.
If you decide to save your results to a citation manager, PubMed will create a file that is then automatically downloaded. This file can be opened with a reference management software.
To the left of the "Send to" dropdown menu shown, you can always email yourself your results and PubMed creates a link to your list in email form, so you can sent it to yourself or others.
