The interface and design was similar to DDial in that users logged into the system with a three digit number that served as a username. Once logged in, the user could change his or her name to whatever he or she wished, while his or her user number served as a unique identifier. Each user was assigned a user level. 0 was for non-members. Callers without a user number could log in for only a limited time (usually 10 minutes, but this could be decreased to 5 when call volume was high.) The numbered levels were for registered users, usually paying members. The upper levels, 50-99 were for various levels of moderators. The sysop could assign a moderator level to any user, effectively giving them power to do various tasks such as creating specialty channels, making links to other STS stations, moderating lower-level users, and kicking out people who were being a nuisance, (one early feature added was used to ban "nuisance" guests from returning after they were kicked, using the then-recently emerging technology of caller ID).