Dialog version of the PURGE command. Allows you to select the entities you wish to purge, without having to invoke the PURGE command several times. In older Autocad version, every purge had to be accepted by pressing "Y", with this program that is automatic. To purge every unused entity, it is often nescessary to repeat the command 2 or 3 times, so we added a slider to set the number of repetitions.