glAttachShader, glBindAttribLocation, glCreateProgram, glDeleteProgram, glDetachShader, glLinkProgram, glUniform, glUseProgram, glValidateProgram
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glIsProgram: man4/glIsProgram.xml
glIsProgram returns GL_TRUE if program is the name of a program object previously created with glCreateProgram and not yet deleted with glDeleteProgram. If program is zero or a non-zero value that is not the name of a program object, or if an error occurs, glIsProgram returns GL_FALSE.
No error is generated if program is not a valid program object name. A program object marked for deletion with glDeleteProgram but still in use as part of current rendering state is still considered a program object and glIsProgram will return GL_TRUE.