Kenya Citizens and Kenya Residents (holders of still-valid permits and passes) travelling to Uganda and Rwanda are issued, on request, an Inter-State Pass (ISP) on production of valid identity documents.
The ISP is issued at the border control is exiting from. It has space for one’s full name, nationality, document number, and signature. Once it has been properly filled one, it is exit-stamped and the traveler allowed to leave.
One can apply for the ISP online through the e-citizen portal https://www.ecitizen.go.ke/.